How Filter Fans Work
Filter fans use ambient air to cool enclosures by drawing filtered outside air in and exhausting warm air out. This creates positive or negative pressure inside the enclosure, depending on the configuration, to maintain proper operating temperatures for your equipment.
Key Benefits:
- Energy Efficient - Uses significantly less power than air conditioners
- Low Maintenance - Simple filter replacement is typically the only routine service
- Cost-Effective - Lower initial cost and operating expenses
- Easy Installation - Panel-mount design for straightforward setup
- Multiple CFM Ratings - Match airflow to your heat load requirements
Common Applications:
- Electrical Control Panels
- Variable Frequency Drives (VFDs)
- PLCs and Automation Equipment
- Power Distribution Enclosures
- Electronics Cabinets
- Indoor Industrial Environments
When to Use Filter Fans vs. Air Conditioners
Filter fans are a good choice when:
- Ambient air temperature is lower than your required enclosure temperature (typically at least 10°F / 5°C lower)
- The environment is relatively clean and free of corrosive contaminants
- Energy efficiency and operating costs are priorities
- Enclosure is in a controlled indoor environment
Consider air conditioners when:
- Ambient temperature is equal to or higher than your required enclosure temperature
- Precise temperature control is needed
- Environment contains oil mist, corrosive gases, or heavy particulates
- Enclosure must be sealed from the outside environment
Product Categories
Intake units that draw filtered ambient air into the enclosure. Available in multiple CFM ratings from compact to high-capacity models.
Shop Filter FansExhaust components to expel warm air from the enclosure. Pair with filter fans for complete ventilation systems.
Shop Exhaust ComponentsKeep your filter fans operating efficiently with genuine Hoffman replacement filters. Regular filter changes maintain airflow performance.
Shop Replacement FiltersAvailable CFM Ratings
Hoffman filter fans are available in a range of CFM (cubic feet per minute) ratings to match your heat dissipation needs:
| CFM Range | Typical Use |
|---|---|
| 14 - 50 CFM | Small enclosures, low heat loads |
| 50 - 100 CFM | Medium enclosures, moderate heat loads |
| 100 - 250 CFM | Large enclosures, VFDs, multiple drives |
| 250 - 550+ CFM | High-capacity applications, large panels |
Need Help Sizing?
CFM requirements depend on your heat load (watts), ambient temperature, and target enclosure temperature. Our team can help you calculate the right size.
Call 877-268-3700