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Flexible Duct Adapter Puzzlement
In our home, we have a horizontally mounted High Velocity HV70-BU air handler. It is by Energy Saving Products in Alberta. The system is similar in principle and construction to a Unico system.
We use it for our home's cooling with a heat pump outdoor unit (we don't use the heat feature due to cost of electricity versus gas) and for humidification with a steam humidifier.
Today, the blower motor started vibrating violently. I removed it and found that the direct drive blower shaft has 3/16" end play and some up-down play. So, a new motor is in order.
But, while I have the system down for repair, a thought came to mind. I'd like to use a flexible connector between the unit's exit and the 8 inch round main duct. The hope is that the flex connector will remove some transmitted noise. What I'm trying to describe is similar to those seen on domestic forced air furnaces, just above the furnace where the metal duct attaches.
The cabinet is rectangular and at the end is a round take-off fitting (8") that has 8" 26 gauge round, steel duct attached. The round duct is the main "trunk" and has branches of smaller diameter metal, round duct; each of which eventually get 2" flex tubing for each room. Between the cabinet and the round duct is where I'd like noise isolation.
The unit lays horizontally on three strips of unistrut with vibrasorb pads between the strut and the unit's cabinet. The strut is hung from the rafters above. (I really, really wish I'd installed this vertically, like a hot air furnace, instead. Service would be so much easier. But, I had to get greedy about saving floor space.)
I could not find a round flexible connector for duct on line. The 2 local wholesalers said they don't exist in round.
What I am wondering is if a rubber pipe coupling, similar to a Fernco, would be OK to use. I'd cut a short piece (maybe 1/4") of round duct out and bridge the gap with the rubber coupling. Since we don't send hot air through the system, do you think that would be Kosher?
Or, can you think of a better plan to put some anti-vibration spacer in the duct?
Thanks Very Much for your thoughts and ideas about my plan!