Blower Air Pressure at Open Area

It depends upon the following:

• The temperature and humidity in which the operative feels comfortable.
• The volume of the working area.
• The shape of the working area.
• The minimum number of air changes per unit time required by local statutes.
• The length of the duct.
• The bends in the duct.
• The temperature and humidity of the incoming air.
• The heat gain from the processes.
• The heat gain or loss from the building to the surroundings, which is a function of latitude, longitude, elevation above seal level and local weather patterns.
• And a host of other things missing from the original post.

The best advice is to consult local heating and ventilating specialists locally, who can attend a site visit, make recommendations and quote to supply sufficient equipment for the business needs. Get at least three quotations from different firms and progress the investment as a health and safety "must do" on the fast track with the justification being operative well-being and the potential loss of the individual to the process putting the line out-of-action.

Consider also maximising the use of insulation materials in and around the hot processes so that there is less heat loss to the operative area. Payback on the investment will be fast and immediate.