Do you have to have MERV 11 filters installed in the ventilation unit that is connected to a garage?

Question: Is it necesary to hard duct ventilation air into each bedroom within the apartment?

Hello, 

We have a 6 storey addition to an existing 4-storeyed building. The mechanical systems for the addition are separate from the existing systems.

Dear All,

Hi,

Hello everyone,

In Europe which parameters shall be considered to establish whether the site is non-attainment area for PM2.5?

Hello,

I have a doubt regarding the need to ventilate refrigerated warehouses or storage rooms.

We have several single zone RTU's that will need direct airflow monitors because the units have DCV.  The contractor says the low OA alarm will be located on the units at the roof.  They