Couple of questions regarding a dryer vent in a an existing home. Background – My daughter and SIL bought a 6 year old house in a short sale deal with the lender, great house, excellent price, 1/2 of what the previous owners owed the bank. This is in Riverside county, southern CA. House was bought as is, no warranty, no negotiations. So far no significant issues have surfaced, previous owners left the home in immaculate condition.
On doing a walk thru I noticed that the dryer vent in the laundry room was 3 inch PVC pipe with a run of about 20 feet straight up and thru the roof. I was not aware PVC was an approved material for a gas dryer vent. But it has been in place apparently since the house was new and seems to be functioning fine. Is PVC code approved in other areas for a dryer vent? Just curious since most I have seen are metal.
Second question. The dryer has a 4 inch exhaust that immediatly gets reduced to 3 inches to go into the 3 inch PVC vent pipe. In my simple mind this is a loss of 25% of the flow volume. Will this affect the dryer performance?
Any help is appreciated.