The Active Sensing System for Lab Exhaust
Maximize your energy savings with on-demand dilution
SmartStackTM is a proprietary, active sensing system that monitors lab exhaust air for 100’s of compounds. The system indexes the exit velocity of the lab exhaust Fans based on the cleanliness of the lab exhaust air.
Continuously monitor the cleanliness of each riser with Photo-ionization Detector (PID).
Index (e.g., “setback”) the high plume fan to lower exit velocity when lab exhaust air is clean, eliminating by-pass air, driving significant energy savings.
Be compliant with ANSI Z9.5. When contaminant levels detected above action threshold, “setback” signal disabled and lab exhaust fan returns to maximum exit velocity for full dilution.
How It Works
Continuously sample each exhaust riser
Calibrated photoionization detector (PID) monitors contaminant level
Fan velocity setback (reducing bypass) only when below contaminant action threshold:
- High dilution rate 3000-4000+ ft/min typical
- Immediately reduce to 3,000 ft/min with monitoring
- Optimize dilution rate: (e.g. 1500 ft/min or less) through dispersion analysis & modeling
When contaminants are detected:
- Setback is disabled
- Sensor protection mechanism enabled
- All sampled locations must report clear before enabling setback.
Various override functions (e.g. occupancy sensor)
Remote performance monitoring via MAP Cloud.
The common industry misconception about
Many assume that exhaust fans are required to operate at 3,000 ft/min (minimum). However, this setting is only a recommendation from ANSI Z9.5. The standard also states lower velocities can be used, provided there is sufficient dilution (from ASSE):
“The exhaust stack velocity shall be at least 3,000 ft/min (15.2 m/s) is required unless it can be demonstrated that a specific design meets the dilution criteria necessary to reduce the concentration of hazardous materials in the exhaust to safe levels at all potential receptors.”