The problem, though, is quality control, and one way to help with that is to make it a little harder to do sloppy work. It costs more to use materials that are harder to mess up. This process provides a mixing of the air and maintains proper air pressure in the house, especially when the windows and doors are closed.

They also refer to standards from other organizations (ACCA, ASHRAE, ASTM...) because this is an installation guide, not a complete reference work. Her articles and interviews have appeared in "The Wall Street Journal," Salon.com and several other publications, covering topics such as Federal Trade Commission policy and media regulations, blogging, home improvement and New York travel. He will need to sign-off on any deviations from plan. I've written a lot about duct problems, especially those in flex duct because they're so abundant. build a walk way across the entire attic wouldn't hurt, because somebody will have to go up there, whether it be a duct smashing pest control guy, or a strangle wire duct standing on smashing cable, phone, alarm, satellite guy who crisscrosses wires everywhere blocking off every path through the attic with his little bitty wires. but in real life people tear them up costing 50 dollars a month. because they gave money to our state governments. It costs more to train employees to do it right. dbill74 you are correct.
what do you except them to do jump up over the ducts, or crawl under them, through the nasty itchy insulation, while trying to balance on flimsy 2x4 trusses spaced 2 foot apart and 2 x4 s criss crossing everywhere. All ducts should be sealed using UL-181–rated duct masticWhen ducts are located outside the conditioned space, they should be sealed to prevent loss of conditioned air and also insulated to prevent thermal loss or gain from the ambient air.Illustration: Air Diffusion Council, “Flexible Duct Performance & Installation Standards,” 5th EditionTo maintain strong airflow, plan for short, straight runs during the design phase. If you can put an equal size duct inside the turn as shown below, they say you're OK.Another biggie that I see all the time is sagging ducts. the heat to warm your house, or to cool your house, to remove humidity, remove pollutants. airtight is good. The diagram below shows that if a flex duct has even 15% longitudinal compression, the friction rate doubles. but you are driving the skilled workers out of this business, ( sheet metal workers who can fabricate any shape out of a flat sheet of metal and who used to run their flex ducts straight with solid metal insulated ducts.) ducts are the air you breath. ducts need to last. To ensure proper connections, minimize leaks and maximize efficiency, it is important to understand how to properly connect the duct work. Listen to the guys on this site. I sent them a RFI but our consultant is damn good you know....After trying that I posted here.You should be able to make a side takeoff rectangular to round transition with a 45* entry. he's not going to crawl around in that insulation, tip toe on joists try not to fall through the sheet rock in your 120 degree attic while jumping over your ducts that are now at waist level. It costs more to do proper design and commissioning.The truth is that there are costs associated with doing it wrong, too. If you really can't bring yourself to buy those The main reason we see so many bad installations is expense. Use flex duct for the straight runs and hardpipe everywhere else. The duct work is made of pieces of sheet metal that are either round or rectangular. the lower the cooler it is. It costs more use the right methods. The designer has selected 200mm flexible duct to connect it with the Plenum of linear bar grille in 4 Nos of multiple connections whereas the Main rectangular duct height itself is 150mm, hence I can't fix 200mm flex duct in a 150mm height of duct. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.This paper describes the design and implementation of several manufacturing simulation use cases at an electronics assembly factory and describes how other factories can use simulation to optimize throughput and cost to make steps forward in their digitalization journey.
They also refer to standards from other organizati… The remaining 1/4 was replaced with atco r8 flex.

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