Installers investigate filter out racks and get right of entry to panels seal tightly to restrict skip air

https://kameronsgbu835.wpsuo.com/how-to-read-furnace-efficiency-ratings-afue-like-a-pro-2

Installers make sure filter out racks and get right of entry to panels seal tightly to hinder pass air, overlaying the heat exchanger and keeping clear airflow.