0512025 – REX RACK (DOOR ON 20″)

A filter rack gives you a permanent, accessible spot to install a return air filter right at your air handler or furnace. The Rex Rack mounts inline with the ductwork on horizontal systems. This version has the access door on the 20″ side for easier filter changes depending on your installation orientation.

Specs: 20″ x 25″ filter size, horizontal mount, access door on 20″ side, built-in duct flange, galvanized steel

Replaces: 0512025, 051202520ACCESS

Fits: Horizontal air handlers and furnaces using 20×25 filters. Universal fit for all HVAC brands.

In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.

Specs

• TypeFilter base
• PositionReturn side, upstream of the blower and coil

Cross-reference numbers

This part replaces the following OEM and aftermarket numbers:

• 0512025

Not sure if your number matches? Call (214) 340-9421 or bring the old part in — bench-testing is free.

Fits these models

• 051202520ACCESS

What size filter base do I need?

It is sized to the furnace or air handler cabinet it bolts to, and to the filter that goes in it. A 20"W x 25"D base takes a 20x25 filter. Measure the cabinet width first - the base has to match the equipment, and the filter follows from that.

Can I put a 4 inch filter in it?

Only if the base is built for it. Some of our bases accept 1", 2" or 4" media; others are 1" only. Check the listing - a 4 inch filter will not go into a 1 inch rack no matter how you angle it.

What is the difference between a filter base and a filter rack?

A filter base is a sheet metal section that sits under the furnace and forms part of the cabinet, with the filter slot built in. A filter rack is a frame that mounts on the return side to hold a filter. Both do the same job in different places.

Why go to a 4 inch media filter?

Far more filter surface area, so it catches more while restricting airflow less, and it lasts six to twelve months instead of one to three. It needs the deeper slot, which is the whole reason to change the base.

Does the filter go in before or after the blower?

On the return side, before the blower and before the coil. That is the point of it - everything downstream stays clean.

Do you stock these?

We keep common sizes on the shelf at 10226 Plano Rd, Suite 104 in Dallas. Bring the furnace model and the cabinet width.