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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.


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Aprilaire filters product list


Aprilaire 6721 Rectangular Duct Damper - 8"x 8"
(Aprilaire 6721)

The Aprilaire 6721 is an automatic damper of the following size: 8 inches x 8 inches The Aprilaire 6721 Rectangular Duct Damper - 8"x 8" is a rectangular duct damper. This ventilation damper is motorized for zone control systems. This motorize

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Special Order. Ships in 4 days.
Aprilaire 6721 Rectangular Duct Damper - 8"x 8"
Our Price: $140.07
Retail: $149.99
You Save 7%!

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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 8 days.
Aprilaire 4236 Humidifier Float Chamber
Our Price: $131.40

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Aprilaire 4183 Humidifier Water Distribution Tray
(4183)

The Aprilaire 4183 Humidifier Water Distribution Tray Cover is a plastic cover that fits into the top of the humidifier water distribution tray. This water tray cover weighs 2.4 ounces.


Special Order. Ships in 3 days.
Aprilaire 4183 Humidifier Water Distribution Tray
Our Price: $15.00
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 3 days.
Aprilaire 4185 Humidifier Baffle Replacement
Our Price: $13.69
Retail: $22.38
You Save 39%!

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Aprilaire 4005 Water Solenoid Valve Assembly
(4005)

The Aprilaire 4005 is the correct replacement for the following humidifiers: Aprilaire Model 110 Humidifier Aprilaire Model 112 Humidifier


Special Order. Ships in 9 days.
Aprilaire 4005 Water Solenoid Valve Assembly
Our Price: $59.95
Retail: $69.99
You Save 14%!

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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 52 days.
Aprilaire 4403 Humidifier Float Chamber
Our Price: $221.70

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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 9 days.
Aprilaire 4406 Humidifier Float Valve Assembly
Our Price: $9.84
Retail: $18.00
You Save 45%!

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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 10 days.
Aprilaire 4258 Humidifier Control Relay
Our Price: $58.53
Retail: $92.75
You Save 37%!

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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 11 days.
Aprilaire 4410 Humidifier Water Level Sensor
Our Price: $32.88
Retail: $34.99
You Save 6%!

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Aprilaire 4330 Humidifier Scale Control Insert 8-Pack
(Aprilaire 4330)

This is an Aprilaire 4330 Humidifier Scale Control Insert replacement for use in conjunction with the Aprilaire Water Panel Evaporator and the Aprilaire Water Distribution Tray in the following Aprilaire humidifiers: Aprilaire 600 Humidifiers, April


Special Order. Ships in 7 days.
Aprilaire 4330 Humidifier Scale Control Insert
Our Price: $71.92

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Aprilaire 4236 Humidifier Scale Control Insert 12-Pack
(Aprilaire 4236)

This is an Aprilaire 4236 Humidifier Scale Control Insert replacement for use in conjunction with the Aprilaire 35 Water Panel Evaporator and the Aprilaire 4277 Water Distribution Tray in the following Aprilaire humidifiers: Aprilaire 560 Humidifier


Special Order. Ships in 8 days.
Aprilaire 4236 Humidifier Scale Control Insert
Our Price: $95.88

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Aprilaire 4093 Humidifier Reservoir Liner
(4093)

The Aprilaire 4093 Humidifier Reservoir Liner is a reservoir liner for several models of Aprilaire humidifiers, including the 445, 445A, and 448. This humidifier reservoir liner is a plastic insert that fits in the reservoir located at the base of y


Discontinued Product Read Description.
Aprilaire 4093 Humidifier Reservoir Liner
Our Price: $12.99
Retail: $19.13
You Save 32%!

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