The diagram below illustrates the difference between exhaust and supply systems. Fan total Pressure is the pressure differential between the inlet and the outlet of the fan. The effect is to increase the energy or pressure in a system as air flows through the elements. System Effect occurs in an air system when two or more elements such as fittings, a hood and a fitting, or a fan and a fitting occur within close proximity to one another. In the example below, the actual pressure loss would be somewhere between -0.75” and -0.6”. In other words, more air flows through the branch with the lower pressure loss/gain or energy state.

Our all products are acknowledged in the national and international markets for the features such as sturdy construction, corrosion resistant finish and easy to install. The comprehensive array of our company is extensively used in core industries such as Gas & Chemical, Oil & Natural Gas, Water Treatment, Mining, Paper plants and many more. We procure the raw material from best manufacturer in India. We supply the material manufactured by reputed manufactures i.e TATA, JINDAL, APL Apollo, MSL, ISMT etc. We have made a system to supplying quality material after checking the procured products on well defined parameters. To keep the procured products in systematic orders till final dispatch, we have also constructed a spacious warehouse. Our warehouse is divided into multiple rooms that helps us convenient storage and dispatch of the procured products. In order to better quantify the equivalent length of piping each fitting equals, WPB made direct measurements of fitting and piping pressure drop at varying airflows.

Belt-driven exhaust fans handle large volumes of air at low static pressures. They run more quietly and allow greater control over fans speeds than direct-drive exhaust fans. Direct-drive exhaust fans have their motor mounted on the fan shaft, so they are more compact and have fewer moving parts than belt-driven fans. The systems designed to reduce radon levels in existing homes are very similar to the systems used in new homes. First, whereas sub-slab horizontal pipes are easy to install before a slab is poured, they cannot easily be installed after. Second, a chase for a vertical pipe can easily be designed into a new home, but the vertical pipe may be more conspicuous in an existing home. Select the location for the ventilation pipe (min. – inch diameter). It should be installed in a vertical run through a warm part of the house and exhausted through the roof. The pipe discharge should be protected from snow drifts and installed at least 1 foot above the roof and 10 feet away from any openings in the building to keep avoid the soil gas from re-entering the building.

Therefore 160 feet is plugged into the Darcy formula to calculate pressure loss for this segment, as shown in Table 1. These systems work best where air can easily move through the soil under the slab. Sub-slab depressurization prevents radon from entering a home by drawing the radon from below the home and venting it through a pipe, or pipes, to the air above the structure where it is quickly diluted. Passive sub-slab depressurization systems shall be constructed to passively transport soil gases out of the house. Provisions shall be made to allow for the addition of an integrated fan in the ventilation pipe to provide active depressurization, where necessary. Several different ways you can move that hot air to the outside. One is to route it over to a soffit vent and attach it to the back of the soffit vent, but this can work against your exhaust fan because that’s actually an air intake, so not as good as other methods.

I use metal plumber’s tape—it’s a galvanized strapping with holes every 1/2 inch for screws. In order to keep the fan effective, try to lay out your installation with minimal turns. Determining the minimum CFM of your bathroom is easy, simply multiply the room’s width × length × height × 0.13. Inspect the framing to determine the best duct path and mounting position for the fan. Moist air can also work its way into a wall cavity and condense inside the wall. Both situations can result in mold, odors and sometimes structural damage. Prior to and even during a bathroom remodel, I often have conversations about tile and fixture layout, style and finish. But the conversation seldom leads to discussion of bathroom ventilation, issues like CFMs, minimizing ductwork and the placement of external heads and backdraft dampers.

The RCI baffled muffler is a 5″ PVC pipe lined with 1/4″ foam. This muffler had the greatest flow restriction and the same noise reduction as the straight through RCI muffler. This muffler has the second greatest flow restriction but provides second best noise reduction. If you bench test a dozen identical radon fans as I have, you will find they vary in the amount of vibration. You can try by trial and error to adjust the clip to the next or previous blade and run the fan to determine if it is getting better or worse. Occasionally during the system installation or after the system has been running something sticks to the fan blades causing an increased vibration. Loosen the rubber boots holding the fan to the system piping and remove the fan. Carefully inspect the blades and scrap them clean with a screwdriver blade or other tool. Shake the fan and run it to clear out any debris in the fan.


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