Filters Fast Logo Header
RETURNING CUSTOMER?
SIGN IN. CONFIRM ORDER. DONE.
Free Shipping on orders over $99 | FREE 365-DAY RETURNS

Product Availability

Please provide your e-mail address below to receive a notification when this product becomes available:

X
X

Thanks! We'll send you a notification when this product is available!

Free Shipping Item Banner
guarantee

Aprilaire 4640 Humidifier Scale Control Insert 10-Pack

4640

$199.90
Only $19.99 per Insert
$19.99 /ea
Retail: $24.99 /ea
You Save: 20%
As low as
$199.90
Retail: $24.99
You Save: 20%
FREE SHIPPING
Special Order. Ships in 5 to 6 business days.
Home Filter Club

Sign up for the Home Filter Club in checkout. You choose how often you want your filter, and we take care of the rest.

FiltersFast.com Home Filter Club
Purchasing for a Business?

Contact [email protected] to gain access to case quantity discounts, account management and terms!

FiltersFast.com Home Business Services

The Aprilaire 4640 is the correct replacement for the following humidifiers:

  • Aprilaire 500
  • Aprilaire 500A
  • Aprilaire 500M

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.

The Aprilaire 4640 Specifications:

  • Contains 1 humidifier scale control insert
  • Works with your 500 series model humidifier
  • Item Weight: 4.8 ounces

The Aprilaire humidifier scale control will direct mineral build up back into your humidifiers evaporative pad, keeping it out of your clean, humidified air. This humidifier scale control is a key feature to keeping your Aprilaire 500 series model humidifier working at peak performance.


Trustpilot

Customer Reviews:

Total Reviews: 8 | Average Rating: 4.8 / 5.0

The filter's work and fit well in my humidifier.

Collected by Trustpilot.com

It was easy to order just what I needed and it came right to my door.

Collected by Trustpilot.com

They seem to be working ok.

Collected by Trustpilot.com

Excellent

Collected by Trustpilot.com

Great product and customer service.

Collected by Trustpilot.com

This is a great product .

Collected by Trustpilot.com

Very expensive

Collected by Trustpilot.com

The best price and high quality make this a no-brainer!

Collected by Trustpilot.com