Anyone having to replace this blower with the new OEM blower is in for a surprise, and not the good kind. The old Torrington blower used 6 offset posts to slip through and lock with a twist then the 11/32 nuts tightened down. The new Huayi blower isn't so. It uses 6 Phillips head screws to pass through the 6 outer edge evenly spaced static holes. The 6 offset holes actually still exist but they use those to secure this big ole fat gasket that immediately separates from the screws as soon as you undo it because there are no washers holding the gasket....so the screws just tear through it. So you have a few options, none good. If you do a simple motor switch and don't change the housing, you cannot use that honking gasket because the gasket has the offset impeller patern like the old housing but it's upside down and the gasket cannot fit over the old threaded screws and allow the motor to slip through it. You can install and use the gasket mounting holes to mount on the posts but you cannot use the gasket. If you want to use the gasket you have to change the whole stupid housing, which doesn't have the quick lock on it for the liner, so that has to be taken off the old housing and reattached and siliconed to the new housing. 1/2 hr to 45 minute process , THEN you have to fiddle with the gasket and Aleign it perfect to get 6 screws through its preformed holes and into the new housing all while at an angle away from you, while supporting the weight of the motor with one hand and holding the gasket and screws with the other totally in the blind through the 6 inches of workspace they offer on this Felix unit. Wtf HHT? Stupid stupid stupid stupid stupid. A simple motor switch that should take 5 minutes takes at least and hour or more, completely frustrated the whole time. Oh, and when your all done....it gets better, cause now you have to Aleign that liner connection back up and hope that the installer left enough slack in the line to allow for it. But, if it's a spring loaded liner your doomed. Now get out the ladder, climb on the roof, release the top plate, hope the liner doesn't fall down the flue (now it's a two person job), come back down, make the connection, go back up secure the top. Then come on back down again. And don't drop your tools down the ash trap that the old installer removed the door from so the stupid unit could sit flat in the fire box. All in, 3.5 hrs. Motor was $350 plus shipping, labor was $460 and my day schedule was totally wrecked. One more reason I hate the Mt Vernon AE insert. Good for you HHT. Another well thought out disaster.