Restricted Bypass Fume Hoods are designed for operation on a Variable Air Volume (VAV) exhaust system (not included with the fume hood). The bypass slots in these fume hoods have been designed to exhaust the minimum volume of air through the fume hood, as recommended by the National Fire Protection Association (NFPA 45-2000 Edition), when the sash is closed. These models offer a full compliment of service fixtures and controls. These units can be supplied with various types of sinks, electrical outlets, airflow monitors, interior linings and other options available upon request. These hoods are Classified by Underwriters' Laboratories (UL) under UL Standard 1805.

Open Bypass Fume Hood
Lab Crafters Open Bypass Fume Hoods are designed for controlled airflow patterns within the fume hood for Constant Air Volume (CAV) exhaust conditions. The bypass slots are an alternate route for air to enter the hood as the fume hood sash is closed. These slots are sized to ensure that as the sash is closed, the fume hood face velocity does not increase to more than three and one half (3.5) times the velocity when the sash is fully open. The bottom airfoil guides air into the hood along the work surface. This feature allows a more uniform internal velocity to be maintained within the hood and provides a continuous air stream to sweep fumes from the countertop workspace. The open bypass fume hoods also offer a full compliment of service fixtures and controls. These units can be supplied with various types of sinks, electrical outlets, airflow monitors, interior linings and other options available upon request. These hoods are Classified by Underwriters' Laboratories (UL) under UL Standard 1805.

Air Sentry™ Fume Hood
The future of Fume Hood Technology is here, now, with the Air Sentry™ fume hood. The Air Sentry High Performance Fume Hoods can reduce the required airflow within the laboratory space by as much as half the amount that is normally required by conventional fume hoods. Even though this fume hood operates with reduced exhaust volumes and face velocities, the Air Sentry™ fume hood actually outperforms conventional fume hoods in containment tests. This high efficiency hood can be used on either a CAV, VAV or a switched two-state exhaust system. The Air Sentry Series fume hoods feature the Vortex Control System, which automates the back baffle to adjust for external influences which may affect hood performance. These hoods also offer a full compliment of service fixtures and controls. These units can be supplied with various types of sinks, electrical outlets, interior linings and other options are available upon request. These hoods are Classified by Underwriters' Laboratories (UL) under UL Standard 1805.