Pex is only legal for supply plumbing. It’s not rigid enough for drain or vent use, as the lack of internal pressure could result in it being constricted.

Where should you not use PEX?

PEX can’t be installed in high heat areas.
You can’t install PEX in high heat areas like near recessed lighting. This also means you can’t connect PEX directly to a hot water heater, but you can use a connecting material to do this.

Can you use PEX for HVAC?





Today, PEX is commonly used in any sort of water conveyance, hydronic radiant heating, snow melting systems, baseboard and fan coil delivery systems, and radiant cooling systems, to name a few. It is even be used to provide radiant heating in artificial turf stadiums like BMO Field in Toronto.

How many psi of air can PEX a hold?

PEX-a pipe can withstand a burst pressure of around 800 psi (almost two times the requirement for ASTM F876, the standard specification for PEX tubing). So neither the pipe nor the fittings are weak points, making for an extremely high-performing system in domestic water and hydronic piping applications.

What are the disadvantages of using PEX pipe?

The biggest disadvantage to PEX is that it is unknown how well or long it will last. While PEX piping is warrantied for up to 25 years, it is unknown what could happen to PEX piping as the years go on. Since it is so new, it is hard to know what water will do to the plastic over 30 years.

What kind of PEX is used for compressed air?

Some of the more frequently used materials are copper, black iron (or galvanized) pipe, stainless steel, PVC, and cross-linked polyethylene, more commonly known as PEX.

Is PEX piping plenum rated?





Uponor PEX-a pipe is approved for installation in plenums and carries a three-hour fire-resistive rating.

Can SharkBite be used for air?

Can I use SharkBite fittings for anything other than potable water and radiant heating (e.g, air, gas, oil, etc.) applications? No. SharkBite fittings are only certified for potable water & radiant heating installations.

What is the best pipe to use for compressed air?

Copper. Copper piping is an excellent choice for use with air compressors. Any condensation that builds up in the system will not corrode copper air compressor lines, so the risk of debris entering the system is very low. It also withstands heat well.

How much psi can 3/4 PEX handle?

In accordance with ASTM F876, the minimum hydrostatic burst pressure for PEX pipe is 480 pounds per square inch (for 1/2-inch pipe) and 475 psi (for 3/4-inch pipe and larger) at 73.4 degrees F.

Is Blue PEX OK for hot water?



Color-Coded: Red PEX pipes can be used for hot water supply lines, blue PEX for cold water supply, and white for either hot or cold.

What is orange PEX used for?

Designed for use on hot and cold potable water lines, Orange PEX tubing is commonly used for radiant floor and hydronic heating applications.

Does PEX freeze and burst?

PEX pipes, just like any pipe, can freeze when the temperature drops too low. Because the pipes are designed to be flexible, PEX has the ability to expand. Although it is still possible for them to burst, this means PEX pipes are less likely to rupture after freezing.

Should you insulate PEX piping?



You should insulate PEX pipes because they can freeze and potentially burst when temperatures drop below 20 degrees Fahrenheit. This is particularly important in cold regions, crawl spaces, attics, or other cold places. Doing so can also improve energy efficiency and reduce moisture and condensation.

Will PEX freeze in attic?

If you are using PEX, you can run it through your attic. PEX will NOT burst unless you live in a place that gets like 50 below. And it does not freeze as readily as metal pipe.