How durable are the grills?
The wood grills are constructed out of select material. We have had grills in homes and businesses for the last few years and all are doing very well. If the wood grills are installed properly and the openings are correctly sized they will give you many years of excellent service. 8. Will the wood grills whistle? We have tested our wood grills in a wind tunnel using a blower motor from a 3 ½ ton air conditioning unit. We started with a 24″ x 24″ wood grill and a 24″ x 24″ metal grill. Using the same blower we restricted the size of the opening until we heard the metal grill whistle – the wood grill did not. We continued to reduce the size of the wood grill, but it never did whistle or vibrate. 9. Will wood grills pick up moisture? Our wood return air grills will not pick up any more moisture than the rest of your finished furniture, moldings and doors in your home or office. The wood grills must, of course, be finished (painted or stained and sealed). 10. How is the grill size determin
