Aprilaire 400A Humidifier Parts

The Aprilaire 400 humidifier requires twice per year maintenance consisting of replacing the humidifier filter (water panel evaporator) and washing out the pad frame and water distribution tray.

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Aprilaire 400 Humidifier
Reg. $492.34
$389.25
Aprilaire 400 Humidifier
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4001 Saddle Valve
Reg. $21.00
$17.50
Saddle Valve
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4004 Strainer Screen
Reg. $6.90
$6.00
Strainer Screen
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4016 Analog Humidistat
Reg. $57.50
$38.45
Analog Humidistat
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4040 Solenoid Valve Assembly
Reg. $115.00
$69.74
Solenoid Valve Assembly
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4231 Yellow Orifice
Reg. $4.25
$3.00
Yellow Orifice
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4335 Feed Tube With Compression Sleeve
Reg. $16.05
$13.38
Water Feed Tube
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4403 Scale Control Insert
Reg. $21.11
$18.36
Scale Control Insert
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4405 Float Cover
Reg. $20.38
$17.73
Float Cover
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4406 Float Assembly
Reg. $19.69
$17.13
Float Assembly
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4407 Water Distribution Tray
Reg. $26.42
$22.98
Water Distribution Tray
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4410 Water Level Sensor Assembly
Reg. $41.19
$35.82
Water Level Sensor Assembly
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45 Humidifier Filter
Reg. $51.06
$44.40
Water Panel (Humidifier Filter 2 Pack)
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50 Current Sensing Relay
Reg. $49.45
$43.00
Current Sensing Relay 24 Volt Style
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50333 Multi Tap 48VA Transformer
Reg. $23.57
$20.50
Multi Tap 48 VA Transformer
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51 Current Sensing Relay
Reg. $66.24
$55.20
Current Sensing Relay 120 Volt Style
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56 AutoTrac Humidistat Controller
Reg. $110.40
$85.12
56 Aprilaire AutoTrac control system.
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58 Automatic Humidistat Controller
Reg. $180.56
$157.99
58 Automatic Humidistat Controller
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8052 Sensor
Reg. $15.29
$13.57
Outdoor Air Sensor
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