I am using 2 S7s to heat some rooms in my house. I was able to cut a hole into my hvac duct and utilize the warm air to blow into the hvac.
Below are a few pics and links to the items I bought to do this.
http://imgur.com/BPmFPK1http://imgur.com/v5AAZH5http://imgur.com/UEBJ4Q6http://imgur.com/igWW4trThe ducting I used that fits perfectly over the S7 fan and connected to the exhaust blower fan. I ran this from the miners to the a register box
http://www.homedepot.com/p/Master-Flow-10-in-x-4-in-to-6-in-90-Degree-Register-Box-90RB10X4X6/100198141 . the register box was connected to the blow fan and than additional flexible duct was run to the hole in the hvac. It was sealed with foil tape.
http://www.homedepot.com/p/Nashua-Tape-1-89-in-x-50-yd-322-Multi-Purpose-HVAC-Foil-Tape-1207792/100030120 http://www.homedepot.com/p/Master-Flow-6-in-x-25-ft-Insulated-Flexible-Duct-R6-Silver-Jacket-F6IFD6X300/100396935The blow fan to suck the air from the S7s to my already existing hvac system.
http://www.amazon.com/VenTech-VT-IF-6-B-Variable-Controller/dp/B005KMPN0KEDITSound Reduction Box made from scraps (looks stupid and ugly but effective)Did this today. Was cleaning out garage and the PSU is loud (Finsky set-up, works amazing but sounds like a jet engine). My son (20 months) kept walking over to is and putting his finger on his lips and saying "shhhh"
Was bored so here it goes.....
So I decided to build a sound reduction box around the rigs and PSU to reduce the sound. This is by no means suppose to look nice, it was left over scraps. I used hvac aluminum tape, nails, screws, scrap wood and insulated with roxul safe 'n' sound insulation.
http://www.homedepot.com/p/Roxul-Safe-n-Sound-3-in-x-15-1-4-in-x-47-in-Soundproofing-Stone-Wool-Insulation-12-Roll-RXSS31525/202531875 The insulation is amazing stuff, fireproof and sound reduction.
Video of roxul product under blowtorch https://www.youtube.com/watch?v=A5ipuxnIzyMPictures are belowhttp://imgur.com/um79DUEhttp://imgur.com/fOECzyjhttp://imgur.com/rIQxmbjhttp://imgur.com/W4FJyuwhttp://imgur.com/8nAQWachttp://imgur.com/X0Sg80Fhttp://imgur.com/c6Mapzjhttp://imgur.com/foDBM0ghttp://imgur.com/7K1kFt9