Comments about Lennox Replacement Filter X6664 (75X74) for PCO-12C - 17 x 26 x 4:

Replaced old filter. This set of filters was still cheaper then what the installer was charging for one.

Comments about Lennox Replacement Filter X6664 (75X74) for PCO-12C - 17 x 26 x 4:

Easy Install. Great Price. [...] Local HVAC company said the only way to buy the filter was to buy the full replacement kit at over [$].

Comments about Lennox Replacement Filter X6664 (75X74) for PCO-12C - 17 x 26 x 4:

I use both the x6664 and x6667 filters for the Pure Air systems that are installed in our home. They both work very well, all you need to do is to replace the filters and lights every year (for the paper filter) or two (for the UV lights and metal filter). I have had zero problems with them. I started with the Merv 8 five years agos when the systems were installed, but have upgrade to the Merv 10, the Merv 16 is still a little pricey for right now.

Comments about Lennox Replacement Filter X6664 (75X74) for PCO-12C - 17 x 26 x 4:

It A Filter

Comments about Lennox Replacement Filter X6664 (75X74) for PCO-12C - 17 x 26 x 4:

works great

Comments about Lennox Replacement Filter X6664 (75X74) for PCO-12C - 17 x 26 x 4:

My filters arrived in quick time. [...] I order ahead so I always have new filters waiting for installation whenever I need it. No local dealer so IAQ is a great option for me.