“Exhaust is not healthy to breathe in nor does it make for safe working conditions. Installing a proper exhaust system is part of the Master Fire Prevention Systems kitchen hood systems and fire suppression services we can….the process in general is easy…”
(https://www.masterfireprevention.com/exhaust-fabrication-kitchen-hood-systems/, pg. 1 and para. 1, retrieved online with permission on April 04, 2017)
Each hood is usually made to custom specifications and considers all major aspects such as restaurant kitchen space. A licensed professional is required to meet with you, prior to fabrication, to discuss all relevant matters and size the space, creating or using existing blueprints to near or exact specification. Space is limited, so precision is key.