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Aprilaire
Humidifier

Model # 445 Official Aprilaire humidifier

Here are the diagrams and repair parts for Official Aprilaire 445 humidifier, as well as links to manuals and error code tables, if available.

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Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 27 parts  |
Humidistat 4258
#25

Model 445 diagram

Humidistat

Part #4258

The manufacturer no longer makes this part, and there's no substitute part

Wick Pad 12
#11

Model 445 diagram

Wick pad

Part #12

The manufacturer no longer makes this part, and there's no substitute part

Knob 4166
#7

Model 445 diagram

Knob

Part #4166

The manufacturer no longer makes this part, and there's no substitute part

Bracket 4095
#17

Model 445 diagram

Bracket

Part #4095

The manufacturer no longer makes this part, and there's no substitute part

Reservoir 4165
#15

Model 445 diagram

Reservoir

Part #4165

The manufacturer no longer makes this part, and there's no substitute part

Board 4159

#NI

All parts diagram

Board

Part #4159

The manufacturer no longer makes this part, and there's no substitute part

Impellor (included In Pump Assembly) (8) 4148
#6

Model 445 diagram

Impellor (included in pump assembly) (8)

Part #4148

The manufacturer no longer makes this part, and there's no substitute part

Reservoir Divider 4092
#13

Model 445 diagram

Reservoir divider

Part #4092

The manufacturer no longer makes this part, and there's no substitute part

Cover-top 4162
#22

Model 445 diagram

Cover-top

Part #4162

The manufacturer no longer makes this part, and there's no substitute part

Valve Sadd 4001
#1

Model 445 diagram

Valve sadd

Part #4001

The manufacturer no longer makes this part, and there's no substitute part

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