Where Does Hvac Filter Go. When you find it the replaceable filter is on the units left side right side top or bottom. In most cases you should have one air filter for each level of your house.

The filter usually fits in a slot on the air return side of the unit. If you need help locating your furnace or air conditioner filter then click here. Well show you which direction to install your air filter and what can happen if its installed the wrong way.
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Most units have built-in furnace racks. In most cases you should have one air filter for each level of your house. Vertical HVAC units These systems are usually found in smaller basements or crawl spaces where space is limited. The filter typically slides.

