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- Dwell BOLD Hybrid ERV – India’s First 4-Stage Advanced Purification Ventilation System
Dwell BOLD Hybrid ERV – India’s First 4-Stage Advanced Purification Ventilation System
http://www.dwellventilation.com/shop/dwell-bold-hybrid-erv-indias-first-4-stage-advanced-purification-ventilation-system-3467 http://www.dwellventilation.com/web/image/product.template/3467/image_1920?unique=c9f3dd5Dwell BOLD 250 / 500 / 1000 Whole-House ERV | 4-Stage Hybrid Technology with Pre-Filter, Carbon, Washable Micro-Dust Collection & H13 HEPA for Severe City Smog
- India’s first 4-stage hybrid purification: Combines a primary pre-filter, activated carbon matrix, washable electronic micro-dust collection cell, and medical-grade H13 HEPA.
- Extended HEPA lifespan: The electronic micro-dust collection cell traps ultra-fine particulate and smoke before it reaches the HEPA, dramatically reducing filter replacements.
- Active pathogen & smoke deactivation: Neutralizes airborne bacteria, viruses, and noxious winter smog before air enters your living areas.
- Enthalpy humidity & cooling retention: Recovers up to 75% of cooling energy while balancing indoor humidity during monsoons and dry winters.
- Compact ceiling-suspended profile: Low ceiling clearance requirement with multi-directional duct spigots for seamless false-ceiling integration.
- Ideal for: Luxury residences, city apartments, and executive offices in high-pollution metropolitan areas facing severe seasonal smog.
Terms and Conditions
1. No Returns
2. Standard Warranty 1 Year
3. Detailed T&C here.
4. By Purchasing you agree to T&C and return policy.
India’s First 4-Stage Hybrid Purification Energy Recovery Ventilator
Portable room air purifiers only do a quarter of the work—they clean dust, but continuously recirculate trapped carbon dioxide, humidity, and stale air in closed rooms. The Dwell BOLD makes your entire home breathe. Installed above your false ceiling, it extracts stale air, odors, and excess moisture while infusing pure, oxygen-rich outdoor air through four synchronized purification stages—all while recovering up to 65% of your cooling energy so your air conditioner runs effortlessly.
India’s First 4-Stage Engine
Pre-filter, Activated Carbon, Electrostatic Precipitator (ESP), and H13 HEPA work as a single chain. Each stage handles what it does best so the next stage never clogs prematurely.
Total Heat & Enthalpy Core
Exchanges both sensible temperature and latent moisture. Incoming summer heat and monsoon humidity are moderated by outgoing cool air, preventing heavy load on your air conditioning.
Active CO₂ & Toxin Flushing
Flushes out exhaled carbon dioxide, cooking fumes, formaldehydes, and VOCs that cause morning lethargy. Delivers oxygen-dense, mountain-fresh air into every living space 24 hours a day.
Washable ESP Micro-Dust Stage
High-efficiency electronic micro-dust collection traps fine airborne particulates with near-zero airflow resistance. Easily rinsed with water, dramatically prolonging HEPA life.
Pure air is the ultimate luxury. Keep your home breathing naturally.
When windows stay shut against city smog and summer heat, indoor carbon dioxide levels quickly climb past 1200 ppm—leaving you feeling groggy, drained, and restless. Standalone purifiers cannot help here because they cannot create oxygen or remove CO₂; they merely scrub the same recirculating air.
The Dwell BOLD replaces stale indoor air with continuously treated fresh outdoor air. By combining an aerospace-grade total heat exchange core with an uncompromising 4-stage purification stack, BOLD guarantees that every breath inside your bedroom or living room is rich in fresh oxygen, free from city particulates, and thermally balanced with your air conditioning.
- Whole-home fresh air distribution with continuous CO₂ evacuation
- 4-stage purification stack: Pre-filter, Carbon, Washable ESP & HEPA
- Recovers up to 65% cooling energy to maintain thermal comfort
- Acoustic comfort engineered for whisper-quiet ceiling installations
Designing ventilation for your villa, apartment, or project?
Our ventilation engineering team assists architects, builders, and homeowners with CFM sizing, static pressure calculation, duct layouts, and ceiling access planning.
Where Dwell BOLD Transforms Indoor Living
Available in 250, 500, and 1000 m³/h models, BOLD integrates discreetly into false ceilings to provide balanced, whole-building ventilation tailored to your exact floor plan.
Luxury Apartments & Floors (BOLD 250)
Engineered for 2BHK and 3BHK homes up to 1,500 sq ft. Continuous fresh air delivery to bedrooms and living rooms without opening windows to outdoor traffic dust, noise, or humidity.
Large Apartments & Villas (BOLD 500)
Ideal for 3BHK to 4BHK luxury apartments and single-floor villa layouts up to 3,000 sq ft. Delivers 550 m³/h of high-pressure airflow across multiple duct runs and ceiling diffusers.
Bungalows & Commercial Zones (BOLD 1000)
Built for sprawling duplexes, multi-floor bungalows, boutique gyms, and executive boardrooms up to 6,000 sq ft. Moves 1000 m³/h at 245 Pa static pressure for centralized whole-building airflow.
Master Bedrooms & Nurseries
Prevents nocturnal CO₂ buildup that causes restless sleep and morning fatigue. Keeps room air light, cool, and oxygenated throughout the night with whisper-quiet acoustic isolation.
Home Theatres & Acoustic Dens
Sealed entertainment rooms suffer rapid air stagnation and heat buildup. BOLD introduces continuous silent ventilation through insulated acoustic ductwork with zero noise transfer.
Executive Offices & Clinics
Continuous air replacement for conference suites, consultation rooms, and wellness clinics, actively extracting airborne bio-contaminants, odors, and chemical cleaning VOCs.
Find the right BOLD model for your space
Our team can help plan ventilation for your apartment, villa, or project.
How Dwell BOLD Purifies Air and Recovers Energy
Unlike conventional single-filter ventilators that quickly choke under Indian particulate conditions, Dwell BOLD uses a four-tier cascading filtration stack paired with cross-flow energy recovery.
Simultaneous Supply and Exhaust Cycles
Two dedicated aerodynamic centrifugal blowers operate in unison. One blower draws outdoor air inside through the filtration stack, while the other simultaneously pulls stale, humid, CO₂-heavy air from bathrooms, kitchens, and corridors.
Cross-Flow Enthalpy Exchange (No Air Contamination)
The two air streams cross paths inside microscopic flow channels separated by a specially treated composite heat-exchange membrane. Heat and moisture pass across the plates without the fresh and stale air streams ever mixing.
Summer Pre-Cooling & Dehumidification
In hot and humid Indian weather, the incoming outdoor air transfers its heat and excess moisture to the cool outgoing exhaust air. Outdoor air enters your room pre-cooled and pre-dried, easing the workload on your air conditioning compressors.
Cascading Filtration Longevity
Because the washable Pre-filter and ESP micro-dust collector remove the bulk of coarse and medium dust, the final H13 HEPA filter is spared from rapid clogging—delivering medical-grade purification with significantly lower replacement costs.
Plan your BOLD ventilation system
Discuss filtration, energy recovery, and duct layout with our ventilation team.
Compare Technical Specifications by Model
Performance verified at 220 V / 50 Hz. Select a model below to review exact airflow rates, static pressures, energy recovery efficiencies, and electrical ratings.
| Power Supply | 220 V / 50 Hz, Single Phase |
|---|---|
| Air Volume (High / Low) | 250 m³/h · 147.1 CFM / 180 m³/h · 105.9 CFM |
| Static Pressure (High / Low) | 210 Pa / 185 Pa |
| Input Power (High / Low) | 150 W / 132 W |
| Noise Level @ 1m (High / Low) | 41 dB(A) / 39 dB(A) |
| Temp Exchange (Cooling / Heating) | 62% / 77% (High) · 65% / 80% (Low) |
| Enthalpy Exchange (Cool / Heat) | 64% / 67% (High) · 63% / 69% (Low) |
| Filtration Stages | 4-Stage Hybrid (Pre + Carbon + ESP + HEPA) |
| Filtration Efficiency | 76.1% Primary · 99.9% HEPA |
| Duct Connection Diameter | Ø150 mm (6") |
| Net Weight | 27.5 kg |
| Power Supply | 220 V / 50 Hz, Single Phase |
|---|---|
| Air Volume (High / Low) | 550 m³/h · 323.7 CFM / 400 m³/h · 235.4 CFM |
| Static Pressure (High / Low) | 255 Pa / 240 Pa |
| Input Power (High / Low) | 230 W / 177 W |
| Noise Level @ 1m (High / Low) | 42 dB(A) / 40 dB(A) |
| Temp Exchange (Cooling / Heating) | 61% / 70% (High) · 59% / 72% (Low) |
| Enthalpy Exchange (Cool / Heat) | 64% / 69% (High) · 65% / 69% (Low) |
| Filtration Stages | 4-Stage Hybrid (Pre + Carbon + ESP + HEPA) |
| Filtration Efficiency | 76.1% Primary · 99.9% HEPA |
| Duct Connection Diameter | Ø200 mm (8") |
| Net Weight | 32.2 kg |
| Power Supply | 220 V / 50 Hz, Single Phase |
|---|---|
| Air Volume (High / Low) | 1000 m³/h · 588.6 CFM / 800 m³/h · 470.9 CFM |
| Static Pressure (High / Low) | 245 Pa / 210 Pa |
| Input Power (High / Low) | 600 W / 500 W |
| Noise Level @ 1m (High / Low) | 48 dB(A) / 46 dB(A) |
| Temp Exchange (Cooling / Heating) | 61% / 60% (High) · 63% / 69% (Low) |
| Enthalpy Exchange (Cool / Heat) | 61% / 65% (High) · 65% / 69% (Low) |
| Filtration Stages | 4-Stage Hybrid (Pre + Carbon + ESP + HEPA) |
| Filtration Efficiency | 76.1% Primary · 99.9% HEPA |
| Duct Connection Diameter | Ø200 mm (8") round spigots |
| Gross Weight | 66.5 kg |
Airflow vs Static Pressure Curves
Pressure performance across BOLD 250, 500, and 1000.
Need help selecting a BOLD model?
Talk to our team about airflow requirements and model selection for your property.
Casing Dimensions & Ceiling Void Requirements
Verify physical housing dimensions, bracket mounting centers, duct spigot diameters, and ceiling drop clearances before framing your false ceiling.
| Body Length (L) | 893 mm |
|---|---|
| Hanger Centers (L1 × L2) | 746 mm × 602 mm |
| Body Width (W / W1 / W2) | 816 mm / 460 mm / 854 mm |
| Body Height (H) | 222 mm (H1 flange: 11.5 mm) |
| Port Centers (D × E) | 563 mm × 75 mm |
| Duct Connection Diameter (F) | Ø150 mm (6") |
| Recommended Ceiling Void | 260 mm minimum false ceiling depth |
| Body Length (L) | 885 mm |
|---|---|
| Hanger Centers (L1 × L2) | 746 mm × 602 mm |
| Body Width (W / W1 / W2) | 816 mm / 460 mm / 854 mm |
| Body Height (H) | 282 mm (H1 flange: 11.5 mm) |
| Port Centers (D × E) | 523 mm × 71 mm |
| Duct Connection Diameter (F) | Ø200 mm (8") |
| Recommended Ceiling Void | 320 mm minimum false ceiling depth |
| Body Length (L) | 1255 mm |
|---|---|
| Hanger Centers (L1 × L2) | 1156 mm × 1116 mm |
| Body Width (W / W1 / W2) | 832 mm / 719 mm / 400 mm |
| Body Height (H) | 365 mm (H1 bracket: 15 mm) |
| Duct Connection Diameter (M) | Ø200 mm (8") round spigots |
| Recommended Ceiling Void | 410 mm minimum false ceiling depth |
Coordinate BOLD with your ceiling plan
Get assistance with installation space, duct connections, and service access.
Expert Answers on Dwell BOLD Energy Recovery
Clear, technical guidance on ERV operation, power consumption, filtration maintenance, and sizing for Indian homes.
Why do I need an ERV if I already have standalone HEPA air purifiers?
A portable air purifier only scrubs the air already inside the room—it cannot bring in fresh oxygen or exhaust exhaled carbon dioxide. In an air-conditioned room with closed windows, CO₂ levels easily spike over 1200–1800 ppm, causing grogginess, shallow sleep, and headaches. Dwell BOLD continuously exhausts CO₂-laden air and introduces 100% fresh, oxygenated outdoor air, passing it through four stages of purification and an enthalpy energy recovery core. It transforms your home from a sealed box into a living, breathing sanctuary.
Will running the BOLD ERV increase my air conditioning electricity bill?
No. In fact, an ERV is specifically engineered to protect your air conditioning efficiency. If you opened a window for ventilation, hot and humid outdoor air would flood inside, forcing your AC to work overtime. BOLD’s total heat exchange core recovers up to 65% of the cooling energy from the outgoing air to pre-cool and dehumidify incoming fresh air. The unit itself operates on energy-efficient fans (consuming only 132W–150W on BOLD 250), adding negligible power consumption while significantly improving overall climate control.
What makes BOLD’s 4-stage hybrid purification unique in India?
Indian urban air contains high dust density that quickly chokes standard HEPA filters within 2 to 3 months. BOLD solves this by cascading four technologies: (1) a washable Pre-filter for hair and lint, (2) an Activated Carbon stage for odors and harmful VOCs, (3) a washable Electrostatic Precipitator (ESP) micro-dust collector that traps fine dust with near-zero air resistance, and (4) a medical-grade H13 HEPA filter. Because the first three stages do the heavy lifting, the HEPA filter lasts significantly longer and maintains high airflow without choking.
How often do the filters need cleaning or replacement?
The primary Pre-filter and the ESP micro-dust collector are 100% washable and reusable—simply rinse them with mild water every 2 to 3 months. The Activated Carbon and H13 HEPA cartridges typically require replacement once every 12 to 18 months under normal residential use. Because the washable ESP captures the majority of fine dust, consumable filter maintenance costs are dramatically lower than conventional systems.
How is the unit serviced once my false ceiling is sealed?
All service is handled through the bottom access panel. During false ceiling work, your interior contractor leaves a standard 450 × 450 mm inspection trap door beneath the unit. When routine maintenance is required, the access panel opens with hand latches, allowing the filters and the total heat exchange core to slide straight down for cleaning without cutting ceiling boards or touching duct connections.
How do I select between BOLD 250, BOLD 500, and BOLD 1000?
Ventilation is sized based on room volume and occupancy (typically targeting 0.5 to 0.75 air changes per hour). For 2BHK to 3BHK luxury apartments up to 1,500 sq ft, the **BOLD 250** (250 m³/h / 147 CFM) is ideal. For larger 3BHK to 4BHK apartments and single-floor villas up to 3,000 sq ft, the **BOLD 500** (550 m³/h / 324 CFM) provides abundant capacity. For sprawling bungalows, multi-floor residences, or light commercial spaces up to 6,000 sq ft, the **BOLD 1000** (1000 m³/h / 589 CFM) provides centralized whole-building performance.
Have another question about BOLD?
Speak with our team for guidance on your ventilation project.
Certificates, Manuals & Engineering Drawings
Download verified technical manuals, wiring schematics, and architectural integration resources for the Dwell BOLD series.
Product Brochure
Explore BOLD 250, 500, and 1000 specifications and dimensions. Brochure PDF coming soon.
Residential Installation Manual
Complete wiring schematics, mounting brackets, filter cleaning instructions, and technical curves for BOLD 250 & BOLD 500.
Download Manual (PDF)Commercial Range Manual
Engineering schedules, dimensions, performance curves, and electrical diagrams for BOLD 1000.
Commercial Guide (PDF)CAD Files
Engineering drawings for BOLD 250, 500, and 1000.
Coming SoonMEP Sizing & CAD Support
Connect with our technical ventilation desk for BIM CAD blocks, CFM calculation sheets, and customized multi-zone layouts.
Request CAD & SizingNeed expert assistance selecting the right ERV for your property?
Talk directly with Dwell Air engineers for heat load calculations, acoustic duct layouts, and tailored warranty packages.
India’s First 4-Stage Hybrid Purification Energy Recovery Ventilator
Portable room air purifiers only do a quarter of the work—they clean dust, but continuously recirculate trapped carbon dioxide, humidity, and stale air in closed rooms. The Dwell BOLD makes your entire home breathe. Installed above your false ceiling, it extracts stale air, odors, and excess moisture while infusing pure, oxygen-rich outdoor air through four synchronized purification stages—all while recovering up to 65% of your cooling energy so your air conditioner runs effortlessly.
India’s First 4-Stage Engine
Pre-filter, Activated Carbon, Electrostatic Precipitator (ESP), and H13 HEPA work as a single chain. Each stage handles what it does best so the next stage never clogs prematurely.
Total Heat & Enthalpy Core
Exchanges both sensible temperature and latent moisture. Incoming summer heat and monsoon humidity are moderated by outgoing cool air, preventing heavy load on your air conditioning.
Active CO₂ & Toxin Flushing
Flushes out exhaled carbon dioxide, cooking fumes, formaldehydes, and VOCs that cause morning lethargy. Delivers oxygen-dense, mountain-fresh air into every living space 24 hours a day.
Washable ESP Micro-Dust Stage
High-efficiency electronic micro-dust collection traps fine airborne particulates with near-zero airflow resistance. Easily rinsed with water, dramatically prolonging HEPA life.
Pure air is the ultimate luxury. Keep your home breathing naturally.
When windows stay shut against city smog and summer heat, indoor carbon dioxide levels quickly climb past 1200 ppm—leaving you feeling groggy, drained, and restless. Standalone purifiers cannot help here because they cannot create oxygen or remove CO₂; they merely scrub the same recirculating air.
The Dwell BOLD replaces stale indoor air with continuously treated fresh outdoor air. By combining an aerospace-grade total heat exchange core with an uncompromising 4-stage purification stack, BOLD guarantees that every breath inside your bedroom or living room is rich in fresh oxygen, free from city particulates, and thermally balanced with your air conditioning.
- Whole-home fresh air distribution with continuous CO₂ evacuation
- 4-stage purification stack: Pre-filter, Carbon, Washable ESP & HEPA
- Recovers up to 65% cooling energy to maintain thermal comfort
- Acoustic comfort engineered for whisper-quiet ceiling installations
Designing ventilation for your villa, apartment, or project?
Our ventilation engineering team assists architects, builders, and homeowners with CFM sizing, static pressure calculation, duct layouts, and ceiling access planning.
Where Dwell BOLD Transforms Indoor Living
Available in 250, 500, and 1000 m³/h models, BOLD integrates discreetly into false ceilings to provide balanced, whole-building ventilation tailored to your exact floor plan.
Luxury Apartments & Floors (BOLD 250)
Engineered for 2BHK and 3BHK homes up to 1,500 sq ft. Continuous fresh air delivery to bedrooms and living rooms without opening windows to outdoor traffic dust, noise, or humidity.
Large Apartments & Villas (BOLD 500)
Ideal for 3BHK to 4BHK luxury apartments and single-floor villa layouts up to 3,000 sq ft. Delivers 550 m³/h of high-pressure airflow across multiple duct runs and ceiling diffusers.
Bungalows & Commercial Zones (BOLD 1000)
Built for sprawling duplexes, multi-floor bungalows, boutique gyms, and executive boardrooms up to 6,000 sq ft. Moves 1000 m³/h at 245 Pa static pressure for centralized whole-building airflow.
Master Bedrooms & Nurseries
Prevents nocturnal CO₂ buildup that causes restless sleep and morning fatigue. Keeps room air light, cool, and oxygenated throughout the night with whisper-quiet acoustic isolation.
Home Theatres & Acoustic Dens
Sealed entertainment rooms suffer rapid air stagnation and heat buildup. BOLD introduces continuous silent ventilation through insulated acoustic ductwork with zero noise transfer.
Executive Offices & Clinics
Continuous air replacement for conference suites, consultation rooms, and wellness clinics, actively extracting airborne bio-contaminants, odors, and chemical cleaning VOCs.
Find the right BOLD model for your space
Our team can help plan ventilation for your apartment, villa, or project.
How Dwell BOLD Purifies Air and Recovers Energy
Unlike conventional single-filter ventilators that quickly choke under Indian particulate conditions, Dwell BOLD uses a four-tier cascading filtration stack paired with cross-flow energy recovery.
Simultaneous Supply and Exhaust Cycles
Two dedicated aerodynamic centrifugal blowers operate in unison. One blower draws outdoor air inside through the filtration stack, while the other simultaneously pulls stale, humid, CO₂-heavy air from bathrooms, kitchens, and corridors.
Cross-Flow Enthalpy Exchange (No Air Contamination)
The two air streams cross paths inside microscopic flow channels separated by a specially treated composite heat-exchange membrane. Heat and moisture pass across the plates without the fresh and stale air streams ever mixing.
Summer Pre-Cooling & Dehumidification
In hot and humid Indian weather, the incoming outdoor air transfers its heat and excess moisture to the cool outgoing exhaust air. Outdoor air enters your room pre-cooled and pre-dried, easing the workload on your air conditioning compressors.
Cascading Filtration Longevity
Because the washable Pre-filter and ESP micro-dust collector remove the bulk of coarse and medium dust, the final H13 HEPA filter is spared from rapid clogging—delivering medical-grade purification with significantly lower replacement costs.
Plan your BOLD ventilation system
Discuss filtration, energy recovery, and duct layout with our ventilation team.
Compare Technical Specifications by Model
Performance verified at 220 V / 50 Hz. Select a model below to review exact airflow rates, static pressures, energy recovery efficiencies, and electrical ratings.
| Power Supply | 220 V / 50 Hz, Single Phase |
|---|---|
| Air Volume (High / Low) | 250 m³/h · 147.1 CFM / 180 m³/h · 105.9 CFM |
| Static Pressure (High / Low) | 210 Pa / 185 Pa |
| Input Power (High / Low) | 150 W / 132 W |
| Noise Level @ 1m (High / Low) | 41 dB(A) / 39 dB(A) |
| Temp Exchange (Cooling / Heating) | 62% / 77% (High) · 65% / 80% (Low) |
| Enthalpy Exchange (Cool / Heat) | 64% / 67% (High) · 63% / 69% (Low) |
| Filtration Stages | 4-Stage Hybrid (Pre + Carbon + ESP + HEPA) |
| Filtration Efficiency | 76.1% Primary · 99.9% HEPA |
| Duct Connection Diameter | Ø150 mm (6") |
| Net Weight | 27.5 kg |
| Power Supply | 220 V / 50 Hz, Single Phase |
|---|---|
| Air Volume (High / Low) | 550 m³/h · 323.7 CFM / 400 m³/h · 235.4 CFM |
| Static Pressure (High / Low) | 255 Pa / 240 Pa |
| Input Power (High / Low) | 230 W / 177 W |
| Noise Level @ 1m (High / Low) | 42 dB(A) / 40 dB(A) |
| Temp Exchange (Cooling / Heating) | 61% / 70% (High) · 59% / 72% (Low) |
| Enthalpy Exchange (Cool / Heat) | 64% / 69% (High) · 65% / 69% (Low) |
| Filtration Stages | 4-Stage Hybrid (Pre + Carbon + ESP + HEPA) |
| Filtration Efficiency | 76.1% Primary · 99.9% HEPA |
| Duct Connection Diameter | Ø200 mm (8") |
| Net Weight | 32.2 kg |
| Power Supply | 220 V / 50 Hz, Single Phase |
|---|---|
| Air Volume (High / Low) | 1000 m³/h · 588.6 CFM / 800 m³/h · 470.9 CFM |
| Static Pressure (High / Low) | 245 Pa / 210 Pa |
| Input Power (High / Low) | 600 W / 500 W |
| Noise Level @ 1m (High / Low) | 48 dB(A) / 46 dB(A) |
| Temp Exchange (Cooling / Heating) | 61% / 60% (High) · 63% / 69% (Low) |
| Enthalpy Exchange (Cool / Heat) | 61% / 65% (High) · 65% / 69% (Low) |
| Filtration Stages | 4-Stage Hybrid (Pre + Carbon + ESP + HEPA) |
| Filtration Efficiency | 76.1% Primary · 99.9% HEPA |
| Duct Connection Diameter | Ø200 mm (8") round spigots |
| Gross Weight | 66.5 kg |
Airflow vs Static Pressure Curves
Pressure performance across BOLD 250, 500, and 1000.
Need help selecting a BOLD model?
Talk to our team about airflow requirements and model selection for your property.
Casing Dimensions & Ceiling Void Requirements
Verify physical housing dimensions, bracket mounting centers, duct spigot diameters, and ceiling drop clearances before framing your false ceiling.
| Body Length (L) | 893 mm |
|---|---|
| Hanger Centers (L1 × L2) | 746 mm × 602 mm |
| Body Width (W / W1 / W2) | 816 mm / 460 mm / 854 mm |
| Body Height (H) | 222 mm (H1 flange: 11.5 mm) |
| Port Centers (D × E) | 563 mm × 75 mm |
| Duct Connection Diameter (F) | Ø150 mm (6") |
| Recommended Ceiling Void | 260 mm minimum false ceiling depth |
| Body Length (L) | 885 mm |
|---|---|
| Hanger Centers (L1 × L2) | 746 mm × 602 mm |
| Body Width (W / W1 / W2) | 816 mm / 460 mm / 854 mm |
| Body Height (H) | 282 mm (H1 flange: 11.5 mm) |
| Port Centers (D × E) | 523 mm × 71 mm |
| Duct Connection Diameter (F) | Ø200 mm (8") |
| Recommended Ceiling Void | 320 mm minimum false ceiling depth |
| Body Length (L) | 1255 mm |
|---|---|
| Hanger Centers (L1 × L2) | 1156 mm × 1116 mm |
| Body Width (W / W1 / W2) | 832 mm / 719 mm / 400 mm |
| Body Height (H) | 365 mm (H1 bracket: 15 mm) |
| Duct Connection Diameter (M) | Ø200 mm (8") round spigots |
| Recommended Ceiling Void | 410 mm minimum false ceiling depth |
Coordinate BOLD with your ceiling plan
Get assistance with installation space, duct connections, and service access.
Expert Answers on Dwell BOLD Energy Recovery
Clear, technical guidance on ERV operation, power consumption, filtration maintenance, and sizing for Indian homes.
Why do I need an ERV if I already have standalone HEPA air purifiers?
A portable air purifier only scrubs the air already inside the room—it cannot bring in fresh oxygen or exhaust exhaled carbon dioxide. In an air-conditioned room with closed windows, CO₂ levels easily spike over 1200–1800 ppm, causing grogginess, shallow sleep, and headaches. Dwell BOLD continuously exhausts CO₂-laden air and introduces 100% fresh, oxygenated outdoor air, passing it through four stages of purification and an enthalpy energy recovery core. It transforms your home from a sealed box into a living, breathing sanctuary.
Will running the BOLD ERV increase my air conditioning electricity bill?
No. In fact, an ERV is specifically engineered to protect your air conditioning efficiency. If you opened a window for ventilation, hot and humid outdoor air would flood inside, forcing your AC to work overtime. BOLD’s total heat exchange core recovers up to 65% of the cooling energy from the outgoing air to pre-cool and dehumidify incoming fresh air. The unit itself operates on energy-efficient fans (consuming only 132W–150W on BOLD 250), adding negligible power consumption while significantly improving overall climate control.
What makes BOLD’s 4-stage hybrid purification unique in India?
Indian urban air contains high dust density that quickly chokes standard HEPA filters within 2 to 3 months. BOLD solves this by cascading four technologies: (1) a washable Pre-filter for hair and lint, (2) an Activated Carbon stage for odors and harmful VOCs, (3) a washable Electrostatic Precipitator (ESP) micro-dust collector that traps fine dust with near-zero air resistance, and (4) a medical-grade H13 HEPA filter. Because the first three stages do the heavy lifting, the HEPA filter lasts significantly longer and maintains high airflow without choking.
How often do the filters need cleaning or replacement?
The primary Pre-filter and the ESP micro-dust collector are 100% washable and reusable—simply rinse them with mild water every 2 to 3 months. The Activated Carbon and H13 HEPA cartridges typically require replacement once every 12 to 18 months under normal residential use. Because the washable ESP captures the majority of fine dust, consumable filter maintenance costs are dramatically lower than conventional systems.
How is the unit serviced once my false ceiling is sealed?
All service is handled through the bottom access panel. During false ceiling work, your interior contractor leaves a standard 450 × 450 mm inspection trap door beneath the unit. When routine maintenance is required, the access panel opens with hand latches, allowing the filters and the total heat exchange core to slide straight down for cleaning without cutting ceiling boards or touching duct connections.
How do I select between BOLD 250, BOLD 500, and BOLD 1000?
Ventilation is sized based on room volume and occupancy (typically targeting 0.5 to 0.75 air changes per hour). For 2BHK to 3BHK luxury apartments up to 1,500 sq ft, the **BOLD 250** (250 m³/h / 147 CFM) is ideal. For larger 3BHK to 4BHK apartments and single-floor villas up to 3,000 sq ft, the **BOLD 500** (550 m³/h / 324 CFM) provides abundant capacity. For sprawling bungalows, multi-floor residences, or light commercial spaces up to 6,000 sq ft, the **BOLD 1000** (1000 m³/h / 589 CFM) provides centralized whole-building performance.
Have another question about BOLD?
Speak with our team for guidance on your ventilation project.
Certificates, Manuals & Engineering Drawings
Download verified technical manuals, wiring schematics, and architectural integration resources for the Dwell BOLD series.
Product Brochure
Explore BOLD 250, 500, and 1000 specifications and dimensions. Brochure PDF coming soon.
Residential Installation Manual
Complete wiring schematics, mounting brackets, filter cleaning instructions, and technical curves for BOLD 250 & BOLD 500.
Download Manual (PDF)Commercial Range Manual
Engineering schedules, dimensions, performance curves, and electrical diagrams for BOLD 1000.
Commercial Guide (PDF)CAD Files
Engineering drawings for BOLD 250, 500, and 1000.
Coming SoonMEP Sizing & CAD Support
Connect with our technical ventilation desk for BIM CAD blocks, CFM calculation sheets, and customized multi-zone layouts.
Request CAD & SizingNeed expert assistance selecting the right ERV for your property?
Talk directly with Dwell Air engineers for heat load calculations, acoustic duct layouts, and tailored warranty packages.