How to Size Central Vacuum Piping
Central vacuum systems use 4-foot lengths of 2-inch PVC tubing. The key to sizing the piping job is planning. The pipes can be run anywhere there's space. That includes under floors; through walls and closets; behind appliances; in crawl spaces and in basements. Pipes can be cut to size and are connected in straight lines, with 45-degree elbows, sweep 90-degree elbows, short 90-degree elbows and sweep 90-degree tees. Heating ducts, plumbing and electrical wiring can all sabotage the job. Does this Spark an idea?
Instructions
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1
Determine the location of the power unit. The power unit shouldn't be installed in a confined, or heat producing area like an attic. Basements or garages are good spaces.
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2
Identify the farthest inlet. The line from the farthest-most inlet to the power unit is called the Main Line. It should be as short as possible.
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3
Identify the Branch Line runs. The lines that feed into the Main Line (with sweeping tees) are called Branch Lines. Use pilot holes, coat hanger wire and stud finders to find unobstructed spaces for the pipe. Use a flashlight to look for electrical cables and plumbing that could snag and also try to identify heating and air conditioning ducts to avoid.
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4
Measure the Main Line and Branch Lines accurately where they will be exposed and estimate the distances where they are hidden. Divide the total length by four (the length of the individual pipes.) The pipes insert into fittings by ¾ inch but don't worry about that because you're not going to be able to be that accurate at this planning stage. Add extra for a safety margin.
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5
Count up the number of elbows and tees you'll need. Sweeping tees are used to connect the Branch Lines to the Main Line. Straight connections are preferred on both the Main Line and Branch Lines with 45-degree connections being better than 90-degrees for clogging reasons.
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