HVAC & Filters

30+ products

Expected delivery: Tue, Nov 17

Air filters and HVAC maintenance supplies for offices, schools, warehouses, shops and multi-family buildings. Browse air filters in standard sizes, depths and MERV ratings, and fans, heaters and HVAC parts for cooling work areas, warming cold spots and keeping rooftop and split systems running. Facility managers and HVAC techs buy these items on a regular cycle, so this section is built around repeat orders.

Choosing the right air filter

  • Use the size on the old filter frame. Filters are sold by nominal size, such as 20 x 25 x 1. The actual size is usually a little smaller, so order by the nominal size printed on the frame.
  • Pick a MERV rating the equipment can handle. MERV is the efficiency scale from ASHRAE Standard 52.2. MERV 8 is common for general use, and MERV 11 to 13 capture finer particles. Higher ratings can add airflow resistance, so check with the equipment maker or your HVAC contractor before moving up.
  • Choose the depth your housing takes. 1 in. and 2 in. filters are common in returns and small units. 4 in. filters last longer in housings made for them.
  • Install with airflow in mind. Each filter has an arrow showing airflow direction. It should point toward the blower.
  • Match fan type to the space. Drum and high-velocity fans move a lot of air in shops, while wall-mount and pedestal fans save floor space. See fans, heaters and HVAC parts.

Filter changes are easy to plan. A business account lets you reorder the same sizes online on approved terms, and buildings with many units can use vendor managed inventory with labeled bins and QR code reordering for filter stock. For case quantities across many sizes, send a quote request.

Heaters and electrical HVAC parts should be installed and serviced by qualified people following the manufacturer's instructions and local code.

Common questions

How often should HVAC filters be changed?

It depends on the filter, the equipment and how dusty the space is. Many 1 in. filters are changed every one to three months. Follow the equipment maker's schedule and check pressure drop or condition on deeper filters.

What MERV rating should I use?

MERV 8 is a common choice for general commercial use. MERV 11 or 13 filters catch finer particles but can restrict airflow in some systems, so confirm the equipment can handle them.

Why is my 20 x 25 x 1 filter not exactly that size?

Filter sizes are nominal. The real dimensions are usually about 1/4 to 1/2 in. smaller so the filter slides into the slot. Order using the nominal size on the frame.

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