Summerset Insulating Liner for 40" Built-In Grills

Which Summerset grills does the GL-SZR40 liner fit?

The 40-inch Summerset Sizzler and Sizzler Pro built-in grills — models SIZ40, SZR40, SIZPRO40 and SZRPRO40. The liner's own part number is GL-SZR40.

Summerset sells several 40-inch grills, and the liner is cut for those four. Read the model designation on your grill and match it to that list before ordering.

I have a TRL Pro 40 — is this the right liner?

No. This listing sends TRL Pro 40 owners to a different part, item GL-TRLPRO30. The TRL Pro 40 insulating liner is the one to look at.

Do I actually need an insulating liner?

You do if the grill is dropping into an island framed with combustible material — wood studs, composite panels, anything that burns. The liner is specified as required for combustible construction, and it is what makes that build safe.

Building code is the second reason. Requirements vary by jurisdiction, so verify what applies where you are before the opening gets framed.

What opening do I frame for it?

The cutout listed for this liner is 41 inches wide, 22 inches deep and 9.75 inches high. Size the island opening to the liner, not to the grill — the liner is a jacket that goes into the island first, and the grill drops into the liner.

What is the liner made of and how thick is it?

#304 stainless steel, in a double-walled insulated construction roughly an inch thick. The stainless is there for corrosion resistance outdoors; the inch of double-wall is what cuts the heat reaching the cabinetry around the firebox.

Will the liner change how the installed grill looks?

No. It is a precision-fit part that disappears into the island, so the grill still sits flush and reads as fully built in once everything is set.

Does a liner restrict airflow to the grill?

It is designed to hold proper airflow and clearances while it is in place, so it does not close off the space the grill needs to run. That is the point of using a purpose-built liner rather than lining the opening with sheet material yourself.

My island is block and stucco — should I still fit one?

A fully non-combustible island is not the case this liner was designed around; it is specified for combustible construction. It still puts an insulated stainless barrier between the firebox and the island interior, and local code may require one regardless, so check your code before you decide to skip it.