This is a ventilation system question. The return air path is the route (usually through ducting but could be through some other route such as a window or vent) that the air takes. Typically a building ventilation system would have both supply and extract systems. The return air path is this.
air operated- spring return
None. Probably the home was built for forced air and converted to boiler/baseboard heating.
SA stands for supply air. Air is delivered to your space from a sort of air handling unit(fan). This is the conditioned air whether heat or cooling. This air would be returned to the air handling unit to be reconditoned through the return air(RA) duct .
If it is the airflow that is making the noise, this is caused by undersized ducts. If you recently had your equipment replaced be sure the airflow is set properly for the size equipment you have. If it is, look into increasing the return air grille size. That may give you some improvement. If the noise is still objectionable the duct size will probably need to be increased.
It is a diagram that shows water risers risers
Risers on a motorcycle are used to raise the handlebar. The handlebars are attached to the risers which in turn are attached to the front end of the bike. They are cylinders made of metal. dmx
Most companies will ship (2) risers in a single set.
You will hear air circulating in the cold air return (or return air grille) when the heater or air conditioner is running.
Bleachers are for people to watch, for example, sporting events, and risers are for the performers, for example chorus's.
I need to know what the codes are on stairs? Treads@risers an hand rails ?for what degree of slope
circulates the water
Risers.
A cold air return is similar to a return air grille, which is needed for air to travel to the furnace to be filtered, heated OR cooled and then recirculated.
They are like risers on a skateboard. I find them great to use, the point of it is you can put them under your trucks so that they are more flexible.
The cast of Early Risers - 2009 includes: Kelley Faulkner as Jen Jayson Kochan as Tom
Voodoo 13: Any skate shop or online skateshop will have the size risers you want.. a1skateboards.com or skatewarehouse.com are a couple of sites to start.