Make-Up Air Systems

Clean Air Matrix

RoboVent engineers are experts in every category of air filtration and ventilation. The four categories below represent the major options for treating your contaminated air. RoboVent has designed solutions for each of these categories and has manufactured air filtration systems of unrivaled quality.

For more information about these categories, see Indoor Air Quality 101.


Large blowers and air filtration equipment draw contaminated air from the plant (typically at the ceiling level), filter it and return it to the plant. This is a proven solution in plants welding large parts with overhead cranes. It reduces the haze in the air, resulting in a cleaner working environment, with no negative pressure or heat loss.


Air in the immediate area of the welding activity is captured in a hood system, then filtered and returned to the plant. This is the best solution whenever possible. It allows for a more flexible system and removes the smoke directly from the operator's breathing zone. There are many types of source capture, including overhead hoods, crossflow hoods, fume arms and fume guns, some of which work better than others.


Large exhaust fans draw contaminated air from the plant and exhaust it directly into the environment, typically through the roof or walls. This is a traditional method and often results in negative air pressure. Also, it is very difficult to climate-control your plant and the system may not work well in the winter.

Air in the immediate area of the welding activity is captured in a hood, sent through ductwork, and exhausted directly into the environment. This is a lower capital cost alternative to filtration, but tends to result in high operating costs and large, unsightly ducting systems that work less efficiently with modifications. It also results in negative pressure problems.

Combat Negative Pressure Created by Some Industrial Ventilation Systems

Most factories require some fresh air to replace process gases that are being exhausted. Make-up air systems allow air to be brought back into your facility and heated to the desired temperatures, even during the coldest months of the year. This will overcome the common problem of negative pressure in a facility.

RoboVent Make-Up Air Units

RoboVent make-up air systems are used in a variety of facilities and for various purposes, including in paint booth systems and in heating industrial facilities. Ours are compact, economical units that can provide large volumes of properly tempered fresh air.

All make-up air units feature 16-gauge galvanized steel construction and have large lifting lugs for easy installation. The burner compartment has 1”(2.54cm) insulation to keep cold air out and make it easier to start on cold winter days. Controls are built in and a remote control panel can be placed anywhere you want — outside your office or on the sidewall of a paint booth, for example. These industrial ventilation systems are available as direct-fired or indirect-fired where the burners are separate from the air stream so the air can be 100% re-circulated into the plant.