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User Projects & Pictures / Re: Pix of a furnace I want to convert
« on: January 09, 2011, 09:45:15 am »
The easy way is to order from Aireco or ReMichael or any HVAC supply the factory replacement. Have Model and serial numbers with you. Most residential units have that roundish hut looking deal in them. Firebrick works but I stopped using it years ago in preferance of plastic refractory
http://refwest.com/plastic.aspx
The plastic is ment for bigger industrial boilers, it "works" like half dryed out play doe, you put a piece in place then use a air hammer or dead blow hammer (orange plastic hammer) to tamp it into place. I would be carefull with the tamping force as the residential units are thin steel. If you need it overhead or vertical for a good distance up then you need to tack weld pins on the wall to hold the refractory in place till cured.
To cure/harden the plastic run heat on it, take your sweat ole time do it slow, if you fire it to fast the escaping steem from within will make cracks in it ( you will allways get a few hair line cracks no biggie). Start with an electric heater for a day then salamander heater
http://refwest.com/plastic.aspx
The plastic is ment for bigger industrial boilers, it "works" like half dryed out play doe, you put a piece in place then use a air hammer or dead blow hammer (orange plastic hammer) to tamp it into place. I would be carefull with the tamping force as the residential units are thin steel. If you need it overhead or vertical for a good distance up then you need to tack weld pins on the wall to hold the refractory in place till cured.
To cure/harden the plastic run heat on it, take your sweat ole time do it slow, if you fire it to fast the escaping steem from within will make cracks in it ( you will allways get a few hair line cracks no biggie). Start with an electric heater for a day then salamander heater