Air filter system and method of installation

An apparatus for retaining an air filter adaptor frame mounted inside a return air duct, said return air duct having a termination point in a wall, floor, or ceiling, comprising:

• an air filter;
• a first frame disposed about said termination point having a first landing area and a second landing area and a first extended sidewall and a second extended sidewall,
• an air filter adaptor frame having an inside and outside surface, a first end and a second end, a first flange disposed about the outer perimeter of said first end, and a second flange disposed about the inner perimeter of said second end;
• and
• said flange disposed about the outer perimeter is mounted on said first landing area.

A method for installing an apparatus for retaining an air filter into a return air duct frame comprising steps of:

• providing a return air duct terminating adjacent to a wall, floor, or ceiling;
• providing a frame disposed about the termination point having a first landing area and a second landing area and a first extended sidewall and a second extended sidewall;
• providing an air filter;
• providing an air filter adaptor frame having an inside and outside surface, a first end and a second end, a first flange disposed about the outer perimeter of said first end, and a second flange disposed about the inner perimeter of said second end;
• and
• inserting said air filter adaptor frame into said existing frame disposed about said termination point until said first flange contacts said second landing area.

A method for installing an apparatus for retaining an air filter into a return air duct frame comprising steps of:

• providing a return air duct terminating adjacent to a wall, floor, or ceiling;
• providing a frame disposed about the termination point having a first landing area and a second landing area and a first extended sidewall and a second extended sidewall;
• providing an air filter;
• providing an air filter adaptor frame having an inside and outside surface, a first end and a second end, a first flange disposed about the outer perimeter of said first end, and a second flange disposed about the inner perimeter of said second end;
• and
• inserting said air filter adaptor frame into said existing frame disposed about said termination point until said first flange contacts said first landing area.