click to enlarge and zoom
Mouse over images for additional views.

Autoflo 40EP Humidifier Filter

SKU#: 40EP
List Price: $36.00 Sale Price: $29.99
Product Description

Autoflo 40EP humidifier filter for your AutoFlo whole house humidifier. The original filter had a plastic frame around it. Unfortunately the plant no longer includes the plastic frame so you MUST reuse the original plastic frame and install it on the new humidifier filter.

Dimensions: 8.5 x 9 x 1.5 Inches

NOTE: This item must be replaced at least once per year. Washing it out to try to reuse it is not recommended.


8 5/8 (inches)
9 (inches)
1 3/4 (inches)
8 (oz)
Replacement Schedule:
At Least Once Per Heating Season
Sprayed Mark on Top
Coated Aluminum
Related Products
Autoflo 401839 Frame

Autoflo 401839 Frame

Sale Price: $9999.99

Filter Frame for 40EP

More info & photos

Product Reviews

Add your review of this product Global rating: 4.93 from 15 reviews
Nov 29, 2019
Excellent by Leon Terry (Clawson Mi US)

It arrived at the time it was promised and in excellent condition. Exactly what I needed. Perfect fit.

Apr 7, 2019
Good fit by John King (Athens OH US)

Filter fit fine, easy install.

Dec 24, 2017
Humidifier Pad by Ken Kremer (Urbandale IA )

Works as expected. Recommend others to use as well.

Sep 26, 2015
Great Product - Great Service by Paul B. (Derwood MD US)

Product was delivered safely and on time. Fits the plastic frame as advertised. So happy to have a new filter.

Nov 27, 2014

This is my second order and I am very happy with the product and quick shipping . Thank you , Ted George

Nov 21, 2014
Autoflo 40EP filter by ( )

The only thing that ticks me off on these filters, is that the frame is no longer included. This means that you have to remove the old filter from the rubberized frame, breaking off all of the flaking calcium, then you have to soak the frame in vinegar or Lime Away over night before you can slide the new filter into it.

Jan 23, 2013
It's a filter by ( )

Not much else to be said - water flows through it... Shipping was fast.

Mar 16, 2012
Autoflo 40EP Humidifier Filter by mike s. (macomb MI US)

Fast delivery and was the exact filter i needed. Will order from again.

Feb 24, 2012
Filter by Paul E. Zellar (Spring Lake Mi US)

The order came in a timely manner and was exactly as ordered.

Dec 27, 2011
Humidifier parts assistance by Gilbert W. Belsky (Merion Station PA US)

Great service! I've been looking for the humidifier parts that I ordered for several years. They cost about $50.00. Heating service people told me my humidifier could not be repaired because parts were no longer available. I had three heater repair specialist estimates of between $700 and $850 to replace the humidifier. Autoflo was a lifesaver!

Dec 27, 2011
Autoflo 40EP Humidifier Filter by James J. Grady (Decatur IL US)

Dec 6, 2011
Service provided by Johannes Eidsheim (Colchester VT US)

Excellent service

Feb 1, 2011
Review by Paul E. Zellar (Spring Lkae Mi US)

I received my order promptly and it was an exact fit for my humidifier. It has been working well.

Jan 3, 2011
Autoflo filter by ( )

Correct part delivered on time at a fair price.

Oct 23, 2010
Autoflo 40EP Humidifer Filter by Angela Slawick (Sterling Heights Mi US)

Thank you for speedy response to my order of Autoflo 40EP Humidifler Filter. I could not find it anywhere in my area 48312. Thanks to your web site I found you and was able to order the above mentioned filter. It is working just fine. Angela


Ontime Mall

McAfee Secure sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams
Credit Card Accepted

Autoflo Humidifier Parts

Same Day Shipping

Special Orders