ducting
american metal 6190938 8 inch roof support 3 wall
for exposed beam ceiling installations available in flat to 1212 pitch standard and for steeper pitches of 1312 to 1812 pitch and 1912 to 2412 pitch use ceiling support when chimney is to be installed in standard ceiling contains stainless steel matte black single wall adaptor features 3 wall size 8 in item weight 9 13 lb sku orgl28352