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Cat 3 vent pipe green house kit went together very well just wish there would have been some instructions. Bought a thimble and used instead of green house plates because of my material in wall.

ACF Greenhouses: I'm sorry you did not receive instructions for installing the vent system. They should have been in a red envelope included with your order.

This kit was everything I needed to get my garage heater installed. It's a nice kit I was looking around on a few different sites but I'm glad I ordered this one. Maybe it was just me but horizontal vent kits aren't easy to find and some of the kits were alot more than this one!

Venting kit worked well.

Good luck finding this stuff locally. I checked with 3 hvac equipment suppliers and none of people there even knew what category 3 or ul1738 was. I resorted to searching online for it and luckily found ACF. I asked the salesperson if this was some special venting required only by Sterling. He told me it is the same piping that has been required for all heaters like this since like 2012. WOW! Glad I didn't listen to these other stores who were trying to sell me something not even appropriate for this heater.