14 Combustion Air Intake Installation, Dom
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Installation of Combustion Air Intake
List of materials needed for the project:
6” galvanized or aluminum Fresh Air Cap 6” pipe
6” insulated flex 6” elbow
20” drive Duct tape Silicone 1 ½”, 1”, ½” zip screws 6” sleeve insulation Silver bullets Band iron 1 ½” metal or plastic straps
List of the tools needed for the project:
Power drill Cordless drill
Sledges hammer Chisel
Crimpier Hammer
Caulk gun Long masonry drill bit
Sawzall Wood drill bit
Utility knife Replaceable-blade snips
Yellow snips
In order to better organize an explanation of the execution of this project I would like to divide it into several steps:
Step #1 – Find a spot on the wall where combustion air intake should be terminated:
Combustion air intake should be terminated to outside nearby furnace and water heater:
P. 1 P. 2
· Find a joist space or look-out which will bring the combustion air intake respectively to the back or to the side of the house
· Find the best spot on the bond where 6” pipe (flex) should be run through (usually in the middle).
Drill a pilot hole through the bond and through the brick by using a power drill with a long masonry drill bit. If you decided to run combustion air intake through look-out or in the space between last joist and basement wall you rather don’t have enough room for the power drill. However, you can drill at the bottom of the future hole or use existing caps, valves, or wires to locale the bond.
Step #2 – Make an opening through the wall:
P. 3 P. 4
· Mark out 7”x 7” square on the wall (check out Fresh Air Cap size if it will cover the future opening)
· Pull out the drill
· Grab a sledge hammer and beat in the middle of the square until it will break bricks all the way through. Usually it’s working because the distance between the brick wall and the bond is approximately 1”.
· Use a chisel and a sledgehammer; chisel it along the line to make an opening bigger, but not much bigger than necessary
· Make two holes in the bond with the ½” drill bit in the top corners of the opening.
· Put sawzall’s blade inside the holes and cut it all the way down
· Knock out the piece of wood with a chisel and sledgehammer
If instead of bricks you have siding on the walls of your house figure out that top of the Fresh Air Cap should be right below siding’s curve.
· Make three holes in the corners of you drawing
· Put sawzall blade inside the holes and cut it all the way down
· Remove piece of siding and knock out the piece of wood with a hammer.
Step #3 – Fastening of the Fresh Air Cap to a wall:
There are three ways how to run combustion air intake:
· By using hard pipes and sleeve insulation
· By using insulated flex
· By using both above
Let’s start with the first one:
P. 5 P. 6
If you are using hard pipes and sleeve insulation:
· Crimp Fresh Air cap’s sleeve with a crimpier
· Shove the sleeve in the opening all the way in
· Go inside and take a measurement. If 6“elbow, when you screw it down to the sleeve, will be ½” away from the basement wall you are good. If not you have to cut sleeve shorter or add piece of 6” pipe. If everything is all right, come back to the outside and fasten Fresh Air Cap to the wall.
If your house is finished by brick, you have to use silver bullets or masonry screws:
· Pre-drill all four corners of the Fresh Air Cap with the ¼” metal drill bit
· Push Fresh Air Cap all the way to the wall, make sure it’s plumb
· Drill holes one by one with ¼” masonry drill bit
· Put the silver bullets in and hammer them down by using a screwdriver and a hammer
· Use silicon around cap’s perimeter
If you have vinyl or wood siding you have several options:
· Cut siding so it fit the Fresh Air Cap and use channels (P. 7)
· Cut siding so it fit the fresh air cap and use silicon to seal the gaps (better to use for wood siding)
· Screw the Fresh Air Cap to the wall with 1 ½” or 1” screws and use silicone to fill up the gaps
P. 7
If you are using 6” insulated flex:
· Push some flex through the opening in the wall from inside
· Pull some of it when outside
· Put Fresh Air Cap in the flex
· Wrap it around with the duct tape
· Screw the duct tape down with the flex behind it to the sleeve with three screws
· Shove the cap in the opening in the wall and pull it from inside
· Fasten it to the wall the way it was explained above
If you are using 6” insulated flex and hard pipes just do everything what was said above.
Step #4 – Run combustion air intake in the basement
If you are using hard pipes and sleeve insulation:
P. 8 P. 9 P. 10
· Put 6” elbow on the Fresh Air Cap’s sleeve and screw it down with two screws
· Put together one full piece (5’) of the 6” pipe
· Put 6” plastic cap which usually supplies with the sleeve insulation on and put the pipe on the floor
· Unroll the 6” sleeve, remove adhesive tape and shake the sleeve until insulation will fall flush with the plastic
· Turn separation of the insulation in the sleeve down
· Raise capped side of the pipe little bit up off the floor
· Pull the sleeve all the way on
· Put the pipe on the 6” elbow and fasten it with two ½” zip screws
· Push sleeve insulation all the way up to the wall
· Put insulation which was there before back in
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