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Model Description:
Eliminates standing water, making it the perfect choice for homes with septic systems, locations where a floor drain is not available or families interested in water conservation. features truly automatic control. has an evaporation capacity of 0.70 gallons per hour. humidifies tightly-constructed homes with to 4,000 square foot in size
Additional Model Information:
Remote sensing bulb
View Owner's Manuals for Aprilaire 400:
Part Categories for Aprilaire 400:
Complete Units | Controls | Covers | Filters | Frames | Hoses, Valves, and Regulators | Other Parts | Transformers | TubingAccessories for all Humidifiers:
Chemicals | Complete Units | Other PartsAll Parts for Aprilaire 400: | ||||
|---|---|---|---|---|
Complete Units | ||||
| Ref. | Image | Part No & Description | Price | |
 | apr400A - Aprilaire Humidifier Unit Auto View Part Info | $203.99 | Add to cart | |
Controls | ||||
| Ref. | Image | Part No & Description | Price | |
 | apr8052 - Outdoor Temperature Sensor View Part Info | $11.53 | Add to cart | |
| 13 |  | APR56 - Humidistat For Autotrac Has Outdoor Temp View Part Info | $92.58 | Add to cart |
| 14 |  | apr4305 - Gasket Automatic Humidifier Control View Part Info | $4.73 | Add to cart |
Covers | ||||
| Ref. | Image | Part No & Description | Price | |
| 5 | | APR4329 - Cover For Aprilaire View Part Info | $76.63 | Add to cart |
Filters | ||||
| Ref. | Image | Part No & Description | Price | |
| 1 |  | apr45 - Wick/filter For Aprilaire View Part Info | $32.99 | Add to cart |
Frames | ||||
| Ref. | Image | Part No & Description | Price | |
| 3 |  | apr4407 - Water Distribution Tray View Part Info | $19.10 | Add to cart |
Hoses, Valves, and Regulators | ||||
| Ref. | Image | Part No & Description | Price | |
| apr4229 - Saddle Valve Adapter View Part Info | $51.54 | Add to cart | |
| 10 |  | APR4231 - Orifice Yellow View Part Info | $4.20 | Add to cart |
| 19 | | APR4406 - Float Assembly Model 400 View Part Info | $13.58 | Add to cart |
| 2 |  | apr4403 - Scale Control Insert/float Chamber View Part Info | $15.12 | Add to cart |
| 20 | | apr4405 - Float Cover View Part Info | $15.12 | Add to cart |
| 7 |  | apr4040 - Water Valve. Can Also Use A01-0814-148 View Part Info | $69.99 | Add to cart |
| 8 |  | apr4004 - In Line Strainer View Part Info | $4.99 | Add to cart |
| 9 |  | APR4001 - Saddle Valve For Aprilaire View Part Info | $19.99 | Add to cart |
Other Parts | ||||
| Ref. | Image | Part No & Description | Price | |
 | apr4280 - Shock Arrestor View Part Info | $129.20 | Add to cart | |
 | GA50 - Relay Current Sensing View Part Info | $36.00 | Add to cart | |
| 15 |  | APR4332 - Damper Assembly View Part Info | $27.96 | Add to cart |
| 16 | | APR4409 - Name Plate Model 400 View Part Info | $13.57 | Add to cart |
| 17 | | APR4408 - Hole Plug Model 400 View Part Info | $7.75 | Add to cart |
| 18 |  | apr4336 - Resistor Case And Manual View Part Info | $10.63 | Add to cart |
| 4 | | APR4404 - Base Model 400 View Part Info | $87.96 | Add to cart |
| 6 |  | APR4410 - Water Level Sensor View Part Info | $29.46 | Add to cart |
Transformers | ||||
| Ref. | Image | Part No & Description | Price | |
| 12 |  | apr4010 - Transformer For Aprilaire View Part Info | $28.40 | Add to cart |
Tubing | ||||
| Ref. | Image | Part No & Description | Price | |
 | qbp28115205 - Flexible Bypass Hose 36 Inch View Part Info | $9.99 | Add to cart | |
| 11 |  | apr4335 - Feed Tube With Compression Sleeve View Part Info | $9.33 | Add to cart |
Accessories for all Humidifiers: | ||||
Chemicals for all Humidifiers: | ||||
| Ref. | Image | Part No & Description | Price | |
 | FSRM6 - Humidafresh Rainforest Mist Water Treatm View Part Info | $6.24 | Add to cart | |
| AC802 - Humidifier Bacteriostatic Water Treatmen View Part Info | $6.82 | Add to cart | |
 | 1T-6 - Humdf Water Treatment32 Oz View Part Info | $5.18 | Add to cart | |
 | FSCA6 - Humidafresh Cinnamon Apple Water Treatme View Part Info | $6.24 | Add to cart | |
 | AC816 - Extra Strength Humidifier Cleaner View Part Info | $5.19 | Add to cart | |
 | FSFV6 - Humidafresh Vanilla Water Treatment View Part Info | $6.24 | Add to cart | |
 | 3US-6 - Water Treatment Cleaner View Part Info | $5.01 | Add to cart | |
 | 1PC-RPS - Humidifier Plastic Cleaner View Part Info | $0.00 | Not Available | |
Complete Units for all Humidifiers: | ||||
| Ref. | Image | Part No & Description | Price | |
 | HAP-440 - Holmes Complete Hepa Air View Part Info | $49.99 | Add to cart | |
Other Parts for all Humidifiers: | ||||
| Ref. | Image | Part No & Description | Price | |
 | MSP-100V - Oem Portable Stereo Speaker View Part Info | $16.99 | Add to cart | |
