Garage to House Sheetrock firewall penetrations, Expanding Ring?

Our building inspector said that we need to have a 'ring' around anything that penetrates the Sheetrock firewall that is between the garage and the house.
This 'ring' goes around Drain/Vent Pipe, Dryer Duct, Electrical Wires, etc. and when it gets hot, it expands to collapse the hole. The HVAC guy called it a medicock ring, though in doing some searching for it I came up with some, er um, interesting sites.
Can someone point me in the right direction?
Thanks, Scott<-
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Scott Townsend wrote:

I think the word he was looking for was "intumescent".
http://www.findarticles.com/p/articles/mi_m0CMN/is_3_41/ai_114475693 http://www.firestopproducts.com/faqs.html http://www.idsemergencymanagement.com/emergency_management/us/Flame_Seal_Products_Inc/flame_seal_products_inc/27_0/g_supplier_4.html http://www.newportpartnersllc.com/IRT_Intumescent_Paint.html
Jim
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Useful set of links. Thanks again Speedy. TB
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Perfect! Thank you!

http://www.idsemergencymanagement.com/emergency_management/us/Flame_Seal_Products_Inc/flame_seal_products_inc/27_0/g_supplier_4.html
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Does that have anything to do with Viagra?
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Search on "firestop ring" or "firestop products"
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Here is a specific example of an intumescent fire collar: <http://multimedia.mmm.com/mws/mediawebserver.dyn?6666660Zjcf6lVs6EVs66641LCOrrrrQ- ______________________________ Keep the whole world singing . . . . DanG (remove the sevens) snipped-for-privacy@7cox.net
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