Blocking sour boil registers for Xmas tree? putting up my christmas tree and the heat registers are too close.even...

putting up my christmas tree and the heat registers are too close.even closed they still enjoy a great deal of fry coming out of them.what else can i do to block the heat .ive thought i could shove a towell down the duct but is this a fire hazzard too.
Is it a dutiful concept to run an...
Answers:    Lift the registers and put a sheet of aluminum foil below them when you replace them.
Where's a honest but cheap place to buy...
Place directional covers on the registers if you are unable to turn the vent stale mechanically.