If your outdoor coil is completely encased in ice or the system stays in defrost mode for excessive periods

Whether you are performing a routine overhaul or troubleshooting a pool heater control board failure

guaranteeing a proper mechanical fit

or excessive ambient heat exceeding the Class H rating

it operates within a range of 3"-6" WC

Aprilaire 310 Media 321142-301 If your outdoor coil isThe Aprilaire 310 Media is a high performance replacement air filter engineered to optimize your home's indoor air quality. Featuring a MERV 11 rating, this whole house air filter effectively captures 85% of pollen, 80% of mold spores, and 50% of dust particles as small as 1 to 3 microns. Designed for the Aprilaire 1310 air purifier and models 2310, 3310, and 4300, it utilizes patented Self Seal technology to eliminate air bypass, ensuring every cubic