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Aprilaire entered the indoor air quality industry in 1938. Less than two decades later, they produced the first marketed, whole-home, evaporative humidifier in the United States. Since that time, they have expanded their product line to include not only humidifiers, but also air cleaners, dehumidifiers, thermostats, ventilation and zone control systems.

The company’s focus has always been to design, create and manufacture top level products to help improve indoor air quality. Commitment to discovering new, innovative ways to establish healthy indoor environments, whether in homes or businesses has contributed to Aprilaire remaining a leader in the HVAC industry.

When it is time to replace the filters on your Aprilaire products, such as humidifiers and air cleaners, make sure you choose genuine Aprilaire replacement filters and parts.


Aprilaire filters full product list:


Aprilaire 4182 Humidifier Water Distribution Tray
(4182)

The Aprilaire 4182 Humidifier Water Distribution Tray evenly distributes water to all of the evaporative panel. The Aprilaire 4182 Water Distribution Tray attaches to the u-shaped scale control insert.


Special Order. Ships in 12 days.
Aprilaire 4182 Humidifier Water Distribution Tray
Our Price: $15.07
Retail: $25.00
You Save 40%!

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Aprilaire 4185 Humidifier Baffle Replacement
(4185)

The Aprilaire 4185 Humidifier Baffle Replacement attaches to the inside of the humidifier's housing and holds the water feed nozzle in place.


Special Order. Ships in 5 days.
Aprilaire 4185 Humidifier Baffle Replacement
Our Price: $14.69
Retail: $22.38
You Save 34%!

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Aprilaire 4187 Humidifier Drain Spud
(4187)

The Aprilaire 4187 Humidifier Drain Spud attaches to the humidifier's base. The drain spud provides a connection for the 1/2" drain hose.


Special Order. Ships in 12 days.
Aprilaire 4187 Humidifier Drain Spud
Our Price: $5.98
Retail: $10.99
You Save 46%!

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Aprilaire 4217 Humidifier Float Chamber
(4217)

The Aprilaire 4217 is a humidifier float chamber filter that works with your Aprilaire 550 and 558 model humidifiers. The Aprilaire 4217 Humidifier Float Chamber is a U-shaped component that encases the water panel inside your humidifier. This will


Special Order. Ships in 9 days.
Aprilaire 4217 Humidifier Float Chamber
Our Price: $51.95

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Aprilaire 4236 Humidifier Float Chamber 12-Pack
(4236)

The Aprilaire 4236 is a humidifier float chamber filter that works with your select Aprilaire humidifier. The 4236 is a U-shaped component that encases the water panel inside your humidifier. This will direct any mineral deposit build up back into y


Special Order. Ships in 10 days.
Aprilaire 4236 Humidifier Float Chamber
Our Price: $143.40

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Aprilaire 4240 Humidifier Male Disconnect Assembly
(4240)

The Aprilaire 4240 Humidifier Male Disconnect Assembly is for use in your select 700 series Aprilaire whole-house humidifier. This item plugs into the humidifier base and will make contact with the female disconnect assembly. This is where a wiring


Special Order. Ships in 12 days.
Aprilaire 4240 Humidifier Male Disconnect Assembly
Our Price: $17.66
Retail: $29.99
You Save 41%!

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Aprilaire 4258 Humidifier Control Relay
(4258)

The Aprilaire 4258 Humidifier Control Relay is used to turn on the fan motor or pump motor of your Aprilaire whole house humidifier. This humidifier relay kit works with your select commercial and residential model of humidifier.


Special Order. Ships in 12 days.
Aprilaire 4258 Humidifier Control Relay
Our Price: $59.53
Retail: $92.75
You Save 36%!

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Aprilaire 4349 Humidifier Door Catch for 2200 2400 4-Pack 4-Pack
(4349)

The Aprilaire 4349 Humidifier Door Catch for 2200 2400 is a door catch replacement kit for Aprilaire humidifier models 2200 and 2400. This Aprilaire door catch is designed for new style doors. This Aprilaire kit includes a door catch, form seal, and


Special Order. Ships in 10 days.
Aprilaire 4349 Humidifier Door Catch for 2200 2400 4-Pack
Our Price: $20.80

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Aprilaire 4403 Humidifier Float Chamber 6-Pack
(4403)

The Aprilaire 4403 Humidifier Float Chamber is a float chamber for Aprilaire 400 model humidifiers. This float chamber is a U-shaped component that encases the water panel of the humidifier and directs any built-up mineral deposits back into the wat


Special Order. Ships in 12 days.
Aprilaire 4403 Humidifier Float Chamber
Our Price: $227.70

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Aprilaire 4406 Humidifier Float Valve Assembly
(4406)

The Aprilaire 4406 is the correct replacement for the following humidifier: Aprilaire Model 400 Humidifier


Special Order. Ships in 8 days.
Aprilaire 4406 Humidifier Float Valve Assembly
Our Price: $10.84
Retail: $18.00
You Save 40%!

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Aprilaire 4407 Humidifier Water Distribution Tray
(4407)

The Aprilaire 4407 is the correct replacement for the following humidifiers: April Model 400 Humidifier


Special Order. Ships in 9 days.
Aprilaire 4407 Humidifier Water Distribution Tray
Our Price: $20.95
Retail: $24.99
You Save 16%!

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Aprilaire 4410 Humidifier Water Level Sensor
(4410)

The Aprilaire 4410 is the correct replacement for the following humidifiers: Aprilaire Model 400 Humidifier Aprilaire Model 400A Humidifier Aprilaire Model 400M Humidifier


Special Order. Ships in 12 days.
Aprilaire 4410 Humidifier Water Level Sensor
Our Price: $33.88
Retail: $34.99
You Save 3%!

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Aprilaire 4517 Humidifier Power Supply
(4517)

The Aprilaire 4517 Dehumidifier Power Supply is a key component to keeping your whole-house dehumidifier working properly. The 4517 power supply replacement keeps your Aprilaire whole-house dehumidifier working at its best.

Free shipping within the continental United States!

Special Order. Ships in 12 days.
Aprilaire 4517 Humidifier Power Supply
Our Price: $109.99
Retail: $199.99
You Save 45%!

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Aprilaire 4518 Humidifier Control Panel
(4518)

The Aprilaire 4518 Control Panel is for use in your Aprilaire 1700 model dehumidifier. This control panel replacement is specially formulated for your 1700 series model and is a key component in keeping your dehumidifier running properly. This piece

Free shipping within the continental United States!

Special Order. Ships in 9 days.
Aprilaire 4518 Humidifier Control Panel
Our Price: $190.95
Retail: $199.95
You Save 5%!

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Aprilaire 4594 Duct Mounted Humidistat
(4594)

The Aprilaire 4594 Duct Mounted Humidistat is for use in your Aprilaire 1150,1160, and 800 model whole-house humidifier system. These steam humidifiers are self contained systems and the humidifier humidistat measures and controls the relative humid

Free shipping within the continental United States!

Special Order. Ships in 12 days.
Aprilaire 4594 Duct Mounted Humidistat
Our Price: $184.00
Retail: $199.99
You Save 8%!

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Aprilaire 4640 Humidifier Scale Control Insert 10-Pack
(4640)

The Aprilaire 4640 Humidifier Scale Control Insert is for use in your 500 series model humidifier. This Aprilaire humidifier scale control is a U-shaped piece that encases your humidifiers water panel evaporator.


Special Order. Ships in 12 days.
Aprilaire 4640 Humidifier Scale Control Insert
Our Price: $159.50

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Aprilaire 4670 Powered Humidifier Motor
(4670)

The Aprilaire 4670 is the correct replacement for the following humidifiers: Aprilaire Model 700A Humidifier Aprilaire Model 700M Humidifier

Free shipping within the continental United States!

Special Order. Ships in 8 days.
Aprilaire 4670 Powered Humidifier Motor
Our Price: $143.57
Retail: $149.99
You Save 4%!

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Aprilaire 4732 Base for Aprilaire 700A 700M
(4732)

The Aprilaire 4732 is the correct replacement for the following humidifiers: Aprilaire Model 700A Humidifier Aprilaire Model 700M Humidifier


Special Order. Ships in 12 days.
Aprilaire 4732 Base for Aprilaire 700A 700M
Our Price: $73.99
Retail: $79.99
You Save 8%!

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Aprilaire 4740 Humidifier Fan Relay for 700A 700M
(4740)

The Aprilaire 4740 is the correct replacement for the following humidifiers: Aprilaire Model 700A Humidifier Aprilaire Model 700M Humidifier


Special Order. Ships in 10 days.
Aprilaire 4740 Humidifier Fan Relay for 700A 700M
Our Price: $15.98
Retail: $22.99
You Save 30%!

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Aprilaire 4851 Humidifier Blower Activation Relay 10-Pack
(4851)

The Aprilaire 4851 Blower Activation Relay is the correct replacement for the following humidifiers: Aprilaire 500 Series Humidifiers Aprilaire 600 Series Humidifiers Aprilaire 700 Series Humidifiers


Special Order. Ships in 7 days.
Aprilaire 4851 Humidifier Blower Activation Relay
Our Price: $249.50

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Aprilaire 50 Humidifier Current Sensing Ray
(Aprilaire 50)

The Aprilaire 50 is the correct replacement for the following humidifiers: Aprilaire, Honeywell HE220, HE225, HE260, HE265, HE360 and HE365 humidifiers.


Special Order. Ships in 12 days.
Aprilaire 50 Humidifier Current Sensing Ray
Our Price: $27.00
Retail: $46.62
You Save 42%!

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Aprilaire 5158 Air Flow Measuring Device
(5158)

The Aprilaire 5158 fits the following model ventilator: Aprilaire 8100 Energy Recovery Ventilator The Aprilaire 5158 Air Flow Measuring Device measures the air flow inside the Aprilaire 8100 Energy Recovery Ventilator.

Free shipping within the continental United States!

Special Order. Ships in 10 days.
Aprilaire 5158 Air Flow Measuring Device
Our Price: $101.11
Retail: $271.63
You Save 63%!

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Aprilaire 4405 Humidifier Float Cover 4405
(4405)

The Aprilaire 400 is the correct replacement for the following humidifiers: Aprilaire 400 Humidifier Aprilaire 400A Humidifier Aprilaire 400M Humidifier Aprilaire 600 Humidifier


Special Order. Ships in 5 days.
Aprilaire 4405 Humidifier Float Cover 4405
Our Price: $16.95
Retail: $19.95
You Save 15%!

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Aprilaire 51 Furnace Current Sensing Relay
(Aprilaire 51)

The Aprilaire 51 is the correct replacement for the following humidifiers:Aprilaire Humidifiers Honeywell HE220, HE225, HE260, HE265, HE360 and HE365 Humidifiers


Special Order. Ships in 10 days.
Aprilaire 51 Furnace Current Sensing Relay
Our Price: $40.99
Retail: $64.70
You Save 37%!

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Aprilaire 60 Digital Humidistat Replacement for Aprilaire 58
(Aprilaire 58)

The AprilAire 58 Automatic Humidistat Control is the replacement component on AprilAir humidifiers 76, 110, 112, 220, 224, 360, 400, 400A, 440, 445, 448, 500, 500A 500M, 550, 558, 560, 568, 600, 600A, 600M, 700, 700A, 700M and 760.


Special Order. Ships in 12 days.
Aprilaire 60 Digital Humidistat Replacement for Aprilaire 58
Our Price: $81.80
Retail: $99.99
You Save 18%!

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