Andrey Smirnov wrote:Besides more important surface for placing of absorbing materials is ceiling.
In one sense there's a lot of room in the ceiling, about 3' height could be completely converted to absorption.
In another, there's the usual 2' diameter round air ducts, sprinklers, and other mechanical stuff up there,
and more importantly they recently put up a false ceiling of brushed aluminum with pot lights.
Some of the brushed aluminum is a little like slats, in that they're sheets about 8" wide by 20' long (0.2 meters x 6 meters), with 4" (0.1 meter) air gap between them, hanging such that there is 3' (1 meter) above them. The rest is a solid false ceiling. I don't recall the percentages of slat/solid, as I didn't really pay attention to that at the time.
Aluminum isn't a fire hazard, and its washable every month to get the grease that probably rises off the burgers and fries and other steamy dishes they sell.
Whereas fabric absorber wrap would have to be replaced -- unless its those zippered bags that someone around here used to sell, which could be put into a washing machine.
The walls are currently covered in faux-brick -- 1/8" thick plastic brick pattern. Seemed to me an easy place to put absorber panels. They used to have photos of movie actors on the walls, so fabric with art seemed possible.