Multi-Story Exhaust Systems

Our multi-story exhaust systems are specified for multistory clothes dryer exhaust, kitchen hood exhaust or bathroom exhaust risers in multi-family dwellings to provide an alternative to energy-consuming, inefficient single-speed exhaust fans. By monitoring the pressure in the riser, the exhaust systems sense the equipment operation and adjust the fan’s speed to prevent over-draft and to avoid low draft situations. The exhaust systems are always active, idling at a minimum speed when the connected equipment is not operating. All of the exhaust fans are equipped with inverter duty motors to further ensure product longevity. The dryer exhaust system is currently the only product tested, approved, and listed for exhausting Type I and Type II multi-story or commercial clothes dryers.

To further enhance the exhaust system design, low-profile subduct risers (LSR) are used to penetrate fire-resistance-rated shaft enclosures. LSRs are utilized when exhausting individual or multiple bathroom, clothes dryer, kitchen or kitchen-hood exhaust ducts to the building’s main exhaust risers. Utilizing the LSR in conjunction with a termination-mounted exhaust fan mitigates the requirements for fire and smoke dampers. The removal of these dampers not only lowers costs, but the LSR is typically installed for less compared to field-erected subduct risers. In addition, the LSR’s low profile allows the exhaust shaft’s area to be reduced.

PRODUCTS:

CLOTHES DRYER EXHAUST

CLOTHES DRYER EXHAUST SYSTEM SEQUENCE OF OPERATIONS

Use
The MDVS is a mechanical exhaust system used to maintain a constant pressure in the exhaust system for multiple type I and type II residential and commercial clothes dryers whether electric or gas-fired.

Description
The MDVS system consists of a BESB Box Ventilator, an MEC18 Modulating Fan Control, and, for three-phase ventilators, a Variable Frequency Drive. The MEC18 maintains a constant pressure for the clothes dryers by modulating the speed of the box ventilator. The MDVS system is listed and supplied as a complete package with fan(s), control(s), pressure transducer, and duct probe.

Operation
The MDVS’s pressure setting must be entered manually via the MEC18 at startup. After these steps have been taken, the control will keep the pressure setting in memory. The MDVS is ‘active’ at all times. As a tumbler activates, the MEC18’s pressure transducer senses the pressure change and adjusts the box ventilator’s speed accordingly. As more tumblers activate, the box ventilator’s speed is increased to maintain a constant pressure. When a tumbler shuts down, the box ventilator will slow down while still maintaining the pressure setting. When the last tumbler shuts down, the box ventilator will slow to a minimum speed.

The MEC18 may be interlocked with an audible or visual alarm to notify the building of insufficient draft or mechanical failure. The MEC18’s integrated proven pressure function may also notify the building in case of a mechanical failure or a power failure to the box ventilator or variable frequency drive (if installed). The MEC18 automatically resets once the proper pressure can be obtained.

Listings
The MDVS is listed to UL705, “Standard for Power Ventilators” and has the following approval from Intertek Group (ETL):

“The product covered by this report is a modulating air exhaust system. The product consists of a box ventilator and a modulating control for permanent installation. Its intended use is exhausting of lint-laden air from single or multiple type I and type II residential and commercial clothes dryers whether electric or gas-fired. The box ventilator can be installed indoors or outdoors.”

KITCHEN HOOD OR BATHROOM EXHAUST

RESIDENTIAL KITCHEN HOOD OR BATHROOM EXHAUST SYSTEM SEQUENCE OF OPERATIONS

Use
The MBES is a mechanical exhaust system used to maintain a constant pressure in the exhaust systems serving residential kitchen hoods or bathroom exhaust fans.

Description
The MBES system consists of a BESB Box Ventilator, an MEC18 Modulating Fan Control, and, for three-phase ventilators, a Variable Frequency Drive. The MEC18 maintains a constant pressure for the kitchen hoods by modulating the speed of the box ventilator. The MBES system is listed and supplied as a complete package with fan(s), control(s), pressure transducer, and duct probe.

Operation
The MBES’s pressure setting must be entered manually via the MEC18 at startup. After these steps have been taken, the control will keep the pressure setting in memory. The MBES is ‘active’ at all times. As a kitchen hood or exhaust fan activates, the MEC18’s pressure transducer senses the pressure change and adjusts the box ventilator’s speed accordingly. As more kitchen hoods or exhaust fans activate, the box ventilator’s speed is increased to maintain a constant pressure. When a kitchen hood or exhaust fan is de-activated, the box ventilator will slow down while still maintaining the pressure setting. When the last kitchen hood or exhaust fan shuts down, the box ventilator will slow to a minimum speed.

The MEC18 may be interlocked with an audible or visual alarm to notify the building of insufficient draft or mechanical failure. The MEC18’s integrated proven pressure function may also notify the building in case of a mechanical failure or a power failure to the box ventilator or variable frequency drive (if installed). The MEC18 automatically resets once the proper pressure can be obtained.

Listings
The BESB is Listed to UL705, “Standard for Power Ventilators”

LOW PROFILE SUBDUCT RISER