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1 Inch Filters
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2 Inch Filters
4 Inch Filters
Specialty Filters
Return Grille Filters
Mobile Home Filters
Electronic Air Filters
Air Purifier Filters & Parts
Carbon Pre-Filters
Air Purifier Filters
Air Purifier Parts
Humidifier Filters & Parts
Whole House Water Panels
Replacement Humidifier Filters
Humidifier Parts
Humidifier Water Treatment
Refrigerator Water Filters
Other
Vacuum Bags & Filters
Refrigerator Air Filters
UV Germicidal Lamps
Dehumidifier Filters
Appliances
Room Air Purifier Units
Portable Humidifier Units
Whole House Air Cleaners
Whole House Humidifiers
Dehumidifier Units
Personal Protection
Industrial & Commercial Filters
3 Ply Cube Filters
3 Ply Panel / Link Filters
Rigid Cell Filter
Pocket Filters
Carbon Pleated Filters
Spray Booth Filters
MERV 8 Filter Pads
MERV 8 Roll Media
Environmental Series Filters
Parts & Accessories
Air Cleaner Replacement Parts
Thermostats & Alarms
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Aprilaire Humidifier Sizing Chart
Model
Tight Home
Average Home
Loose Home
Aprilaire Model 500
3,000 sq.feet
1,500 sq. feet
750 sq. feet
Aprilaire Model 600
4,000 sq.feet
2,000 sq. feet
1,000 sq. feet
Aprilaire Model 700
4,200 sq.feet
2,100 sq.feet
1,500 sq.feet