Air curtain sizing
Use door width, clear opening height, mounting height, voltage, and heated preference before comparing air curtain sizes and dimensions.
Tools
Ventilation, CFM, Fan Size, and Air Curtain Calculators
Use MiWind calculators for ventilation CFM, fan size, vent size, bathroom fan CFM, dehumidifier sizing, air curtain sizing, ACH, ERV/HRV, and duct pressure in US units.
Calculator Index
Find the right calculator
Start with the job to be sized, then keep the room, doorway, duct, moisture, and document details attached to the calculator result.
| Calculator query | Recommended route | Tool | Next product or guide |
|---|---|---|---|
| Ventilation calculator, CFM calculator, or fan size calculator | Use room area, ceiling height, target ACH, room use, source condition, and duct path before choosing a fresh-air, exhaust, or duct fan route. | Ventilation CFM Calculator | Ventilation CFM Chart |
| Bathroom fan calculator or bathroom exhaust fan CFM calculator | Use bathroom area, ceiling height, duct length, elbows, termination, moisture level, and sone target before exhaust fan review. | Bathroom Fan CFM Calculator | Bathroom Ventilation |
| Dehumidifier sizing calculator or commercial dehumidifier sizing | Use area, current RH, target RH, temperature, moisture source, drainage, and duty cycle before dehumidifier model review. | Commercial Dehumidifier Sizing Calculator | Dehumidifier Size Chart |
| Air curtain sizing calculator | Use finished door width, clear opening height, mounting height, traffic, voltage, and heated preference before comparing air curtain sizes. | Air Curtain Sizing Calculator | Air Curtain Size Chart |
| Duct fan static pressure calculator | Use target CFM, duct size, length, elbows, filters, grilles, termination, sound target, and service access before fan curve review. | Duct Fan Static Pressure Calculator | Duct Fan Selection Guide |
| Heat recovery ventilator sizing / ERV HRV worksheet | Use outdoor-air CFM, climate, humidity goal, occupancy, duct route, filter access, and service clearance before fresh-air system review. | Heat Recovery Ventilator Sizing Worksheet | ERV vs HRV Guide |
Fan size and room CFM
Start with room ventilation CFM, fan size, and vent size inputs before ventilation fan, fresh air, or exhaust equipment review.
Bathroom fan CFM
Start with a bathroom fan calculator for CFM, duct length, elbows, moisture level, and sound expectations before exhaust fan review.
Duct fan pressure
Collect target CFM, duct size, length, elbows, filters, and grilles before fan curve review.
Dehumidifier sizing
Use a dehumidifier sizing calculator for commercial moisture review with area, dampness, temperature, moisture source, and drainage.
| Search task | Inputs to collect | Calculator route | Next product or guide |
|---|---|---|---|
| Air curtain sizing | Door width, clear height, mounting height, traffic, voltage, and heated preference. | Air Curtain Sizing Calculator | Air Curtain Size Chart |
| Ceiling mounted air curtain review | Ceiling opening, recess depth, finished width, service access, controls, and voltage. | Air Curtain Sizing Calculator | Ceiling Mounted Air Curtain |
| Restaurant ventilation CFM | Dining room, restroom, service corridor, storage, or kitchen-adjacent room volume, source condition, exhaust path, sound target, and duct route. | Ventilation CFM Calculator | Restaurant Ventilation Systems |
| Ceiling exhaust fan review | Room size, ceiling location, duct length, elbows, termination, sound target, controls, and service access. | Bathroom Fan CFM Calculator | Ceiling Mounted Exhaust Fans |
| Commercial dehumidifier sizing | Area, current RH, target RH, temperature, moisture source, drainage, duty cycle, and service clearance. | Commercial Dehumidifier Sizing Calculator | Dehumidifier Size Chart |
| Gym or fitness center moisture | Peak occupancy, activity load, fresh-air target, humidity source, temperature, drainage, odor, filter path, and service access. | Commercial Dehumidifier Sizing Calculator | Fitness Center Ventilation |
| Office or classroom fresh air | Room list, occupancy, area, ceiling height, fresh-air CFM or ACH target, filtration, sound target, duct route, and service access. | Ventilation CFM Calculator | Office Space Ventilation Fans |
| Restaurant duct fan pressure | Target CFM, duct length, elbows, termination, filters, access, and whether the fan supports fresh air, exhaust, transfer, or support-room ventilation. | Duct Fan Static Pressure Calculator | Duct Fan Selection Guide |
| Bathroom fan calculator | Bathroom area, ceiling height, duct length, elbows, termination, moisture level, and sone target. | Bathroom Fan CFM Calculator | Exhaust Fan Sone Ratings |
| ERV HRV ventilation | Climate, humidity goal, room use, occupancy, filter expectation, duct access, and service clearance. | Heat Recovery Ventilator Sizing Worksheet | ERV vs HRV Guide |
| Inline cabinet fan pressure | Target CFM, duct diameter, straight length, elbows, filters, grilles, termination, and service access. | Duct Fan Static Pressure Calculator | Cabinet Centrifugal Fan |
Calculator Tools
Air Curtain and Fan Calculators
Air Curtain Sizing Calculator
Estimate air curtain size from door width, opening height, mounting height, opening type, heating preference, voltage, and model document handoff.
- Door width
- Door height
- Mounting height
- Opening type
Room Ventilation CFM Calculator
Estimate planning airflow for rooms, offices, classrooms, restaurant support spaces, storage rooms, and gyms from area, ceiling height, target ACH, room use, source condition, and duct path before equipment review.
- Area
- Ceiling height
- Target ACH
- Room type
Bathroom Exhaust Fan Sizing Calculator
Estimate bathroom exhaust CFM from room area, ceiling height, moisture use, duct size, duct length, elbows, termination, and sone target before ceiling-mounted exhaust fan or inline duct fan review.
- Bathroom area
- Ceiling height
- Moisture level
- Duct length
Commercial Dehumidifier Sizing Calculator
Estimate a commercial dehumidifier capacity class from area, current RH, target RH, temperature, drainage, duty cycle, and moisture source for basements, storage rooms, cold rooms, gyms, and moisture-sensitive spaces without promising final humidity.
- Area
- Dampness level
- Temperature
- Usage type
CFM to ACH Calculator
Convert airflow and room volume into estimated air changes per hour for early ventilation planning and how to calculate ach questions.
- CFM
- Area
- Ceiling height
Calculator Limits
What calculator results can and cannot decide
Calculator output summarizes project facts for review. Product data, installation conditions, code requirements, and model documents still control final selection.
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