exhaust fan not sucking the air from garbage room 1

[moideen]

Hi guys,
I am facing a problem on garbage room, there is not proper air exhausted and smell is coming to outside. I checked the garbage extract fan, found it is working and air is also discharging. But in garbage room, air is not drawing through duct and air is return to garbage box. So the positive pressure in garbage room. So I have doubt on the capacity and static pressure. The details are below
Building =g+71 floor.
garbage room Area =1194.7 ft2
Height = 12 ft.
Volume = 14,336 ft3
Duct effective length(EL)=950 FT.
EXISTING UNIT DETAILS
Duct = 31 inch.
CFM =2884 CFM.
STATIC =1.7WC.
What will be the problem? Any answer would be appreciated.

thanks
moideen-dubai

 

[moideen]

find the attached drawing of garbage chute

 

[berkshire]

moideen
I am sorry I do not see any notation or instance of that flex duct I only see the sweeper. Was it supposed to be there?
Now that you have the fan working you can do a better check for leaks.
I am presuming that you have checked all of the access doors .
If the access doors are good the only other source for leaks is the chute itself.
You have seen my prior remarks on that. If you do have to work on the chute, put safety nets in, on the floor above the worker.
It is amazing how some people in high rise buildings can get around lock outs and placards to drop their trash down the chute.
Is there any way you can get into the chase to inspect the exterior of the chute ?
B.E.

You are judged not by what you know, but by what you can do.

 

[moideen]

You are correct Berkshire, all doors have been checked and repaired. I am planning to see any leakage inside the chute and searching contractors with camera system. Some duct cleaning contractors have camera system to go inside and find the exact location of leakage. I don’t know it would be success.

 

[berkshire]

Moideen,
Good luck , the repair when you find the leak is the hardest part.
B.E.

You are judged not by what you know, but by what you can do.

 

[LittleInch]

Those zig zags every 10 floors look like they will get some battering. It's probably as good a place to start as any other.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[moideen]

littleinch, good thought, noted point.

 

[berkshire]

Adding to Little inches point,
I have had personal experience in High rise buildings, of builders who are doing remodeling, throwing things they are, not, supposed to, down those chutes, including bricks and stones from demolished walls. In one building I had to repair they punched a 9" dia hole through an elbow near the trash compactor.
B.E.


You are judged not by what you know, but by what you can do.