regularguy said:Roy, my box has two fans @ 600cfm each. One blows in and one exhausts. They both have insulated duct connected to them to cut noise. The generator actually runs about 15 degrees cooler than if in free air.
regularguy said:I made it in three pieces. The base, the side enclosure and the lid. The base is 3/4 plywood, the sides and lid are of aluminum sheet riveted to corner molding. The whole assembly is lined with 2" rigid duct insulation (the kind you see on duct-work and is silver in color). The fans (duct booster fans, 600 cfm ea)are mounted in the side assembly. One blows in and one blows out. The insulated duct is just that. It is flexible duct used in the HVAC industry and usually runs from a main rigid duct to a ceiling mounted diffuser. The was I use it is I roll the generator onto the base, put the side assembly over and then put the lid on. the lid and side assembly have the two halves of hinges that slide apart. There is a small cut-out for the cords and one for the exhaust. I put a piece of rigid foil faced pipe insulation in the hole and it mates with the muffler by way of an old speaker magnet. I also installed a temperature sensor on the head of the engine and set it at 20 degrees above its free air operating temperature. The sensor / relay will cut both lines to the breaker and ground the ignition. That way no electrical appliances etc will suffer low voltage as the generator shuts down on temperature safety.
one more note: the fan that blows in... blows on the engine
naterv said:While on the topic of generators, I was wondering if anyone has tried attaching a more substantial muffler to a generator? I always wondered if I were to make a new exhaust system with a small car muffler or similar, and some longer exhaust pipe, if that would hush it down quite a bit.
naterv said:While on the topic of generators, I was wondering if anyone has tried attaching a more substantial muffler to a generator? I always wondered if I were to make a new exhaust system with a small car muffler or similar, and some longer exhaust pipe, if that would hush it down quite a bit.
regularguy said:I made it in three pieces. The base, the side enclosure and the lid. The base is 3/4 plywood, the sides and lid are of aluminum sheet riveted to corner molding. The whole assembly is lined with 2" rigid duct insulation (the kind you see on duct-work and is silver in color)....
one more note: the fan that blows in... blows on the engine
Ned said:Adding a muffler may increase the exhaust back pressure and impair the operation of the generator.