Aprilaire 4740 Relay for 700 and 700M Humidifiers,
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Aprilaire 4737AA

Aprilaire 4602AA Ionizer Wire Model 5000 Air Cleaners After May 2005 (3 Pack),
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Aprilaire 45AA

Aprilaire 4728 Blue/Gray Cover for 400/400M, 500/500M and 600/600M Humidifiers

Aprilaire 4655AA

Aprilaire 4407 Water Distribution Tray for 400, 400M Humidifier

• Water distribution tray distributes water evenly to all portions of the water panel
• It attaches to the U-shaped scale control insert part number 4403

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Aprilaire 4406

Aprilaire 4410 Water Level Sensor Assembly for Aprilaire 400, 400A and 400M Humidifiers, 24 VAC , 5-3/4" L Water level sensor assembly to fit certain Aprilaire models. Fits at the bottom of the scale control insert. It has 2-magnetic reed switches wired in series in it which look for the location of the 2-floats that are sold separately. If both floats are sitting at the bottom of the sump (there is no water in there) the 2-magnetic reed switches will close. This turns the water solenoid valve on and sends water to the top of the pad. Excess water then runs down into the sump causing the 2-floats to float up and break the circuit to the solenoid valve. If either float rises up the level sensor switch will open and close the solenoid valve.

Aprilaire 4407AA

Aprilaire 4793 Maintenance Kit for 550, 550A and 558 Model Humidifier

Aprilaire 4788AA

Aprilaire 4750 Maintenance Kit for 700, 700A, 700M, 760, 760A and 768 Humidifiers

Aprilaire 4740

Aprilaire 4640 Black Plastic Scale Control Insert for 500, 500M, 600 and 600M model Humidifiers

• Easy to install and remove
• Cleanable, see maintenance instructions
• Drain hole down orientation

Sid Harvey Item #:4640AA: Replaces Part #:'s : 2247,
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Aprilaire 4602AA

Aprilaire 4839 Maintenance Kit For Use with 600, 600A and 600M Model Humidifers

Aprilaire 4837

Aprilaire 4837 560 Humidifier Maintenance Kit,

Aprilaire 4822

Aprilaire 50 Current Sensing Relay, 21 - 24 VAC , 4 amp

Aprilaire 4991AA

Aprilaire 510 High Efficiency Media Air Filter, 28 x 31 x 4", MERV 11

• 510 air filters helps keep your HVAC equipment running at peak efficiency
• Change Aprilaire 513 air filters once a year
• Patented SelfSeal dramatically reduces air bypass, improving media performance
• Collapsible media with self spacing pleats installs in seconds
• Exclusive media design protects your replacement media business
• Made in USA

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Aprilaire 501AA