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Lennox X6673 OEM 20x25x5 MERV 11 HCF20-11 HCF20-16 Replacement Filter

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This Genuine OEM Lennox replacement filter (X6673) is the same as HCF20-10, HCF20-11 and fits model number Air Cleaner Cabinet HCC20-28. This MERV 11 filter has a nominal size of 20 x 25 x 5 and an actual size of 19 3/4 x 24 3/4 x 4 3/8.This filter is up to twenty times more effective than ordinary fiberglass filters. High efficiency filter media collects small dust particles before they can collect on your coils. No assembly combs needed...filter just slides right in! This product is listed and rated by Underwriters Laboratories as U.L. Class 2.

  • Nominal size 20" x 25" x 5"
  • Actual size 19 3/4" x 24 3/4" x 4 3/8"
  • Model X6673
  • 98% efficient filtration media
  • Recommended Replacement Every 3 Months
  • Up to twenty times more effective than ordinary fiberglass filters No assembly required

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Customer Reviews

Based on 21 reviews
Patricia Grabowski
Will re-order every year as needed. Good service from the company.

We have been pleased with these filters and will continue to reorder as needed.

Al N
Great Place to Buy Filters

First time user. Excellent web site with extensive product line; excellent pricing; easy ordering process - and received my order in a timely manner. This will be my Go To site for future filter needs!

Jill Doemer

This is the filter I previously have purchased from my HVSC provider. Less expensive to purchase on-line. My HVSC provider will install it at the semi-annual Maintenance appointment.

Loretta Giles
Furnace filter

Excellent website and service. I received my filter early after ordering online. I am very pleased with the professionalism and efficiency of this company, which I have used in the past. The filter was sent by FedEx at no additional cost to me.

Michael Graves
Great response

I had a problem with my delivery via Fedex through no fault of Atomic Filters (AF). Yet, AF responded immediately with a replacement filter and have earned my loyalty for the remainder of the life of my heater (at least 10 more years).