|Review by English||posted 05-13-2014 10:48 PM||11499 views||7 times favorited||19 comments|
I am a retired engineer. I have a 672 sq. ft. shop. I purchased my 2.5 hp Tempest S in Jan 2014. I built a isolated support stand out of 2” x 4” board and mounted the Tempest so that the top was at 110” about 10” from the ceiling. I installed a 6” sheet metal duct system made of 6” 26 gauge snap lock duct and 6” 26 gauge fittings. I was able to find the 26 gauge 6” duct, 90° elbows and reducers at Ferguson. I found the flue style wyes at Home Depot online. The 6” blast gates are shop made.
At start-up the Tempest was much louder than noted in the specs. The spec calls for 76 db out of the box. It was at 92 db. I first changed the discharge pipe from the blower to the filters from a metal duct to clear flexible pipe. This lowered the db reading to 86 db. I isolated the dust collector from the suction duct with a 6” section of 6” flexible duct. This lowered the db reading to 85 db. I then built a Muffler it is 38” long and 12” in diameter with a 6” inlet and outlet, it has a 1 ½” layer of acoustic foam and a 1 ½” layer of fiberglass insulation. To my surprise this only lowered the db to 81 db. My collector is installed in a corner with the motor blower unit only 10” from the ceiling. As I tested to see where the noise was coming from I decided it was from sound attenuation by the walls and ceiling in that corner, so I installed 1 ½” egg crate acoustic foam in the corner on both sides and the ceiling for 36”. This lowered the db reading to 76 db. 76 db is very tolerable, so I plan to leave it as is.
My worst case run of duct is 7” of static; the collector is pulling 1000 cfm at that SP. I have found that I can leave both 4” gates to the table saw and a 6” gate to the miter saw open and still get excellent dust pick up. I have 19 gates in my system and 200 ft total of 6” duct. The unit works great, no more big clouds of dust in the shop. I have installed a pressure gauge on my filters to let me know when they need cleaning, I also separated the filters by building a 2nd filter clean out base and installing a bullhead wye before the filters, this puts them in parallel. I installed a 6” blast gate between each filter and the wye. This allows me to close one gate at the top of one filter and open the re-circulation blast gate at the bottom of the same filter which reverses the flow through the filter and aids in the filter cleaning. I do this each day and my filter pressure readings are the same as they were when the unit was installed. The filter gates can be seen on the pictures above.
I highly recommend the 2.5 hp Tempest S. It is a great deal!!!
-- John, Suffolk Virgina