The Fan
Centrifugal Fan, 24VDC Supply Voltage, 6850RP Speed Rating, 38.88W Rated Power
- Airwatts for fan = 34.35AW; Air flow of single fan = 1.61 m^3/min; Static pressure of single fan = 1280pa
Parallel flow configuration was chosen to increase total airflow of entire fan system.
- 6 of such fans can provide sufficient Airwatts for our system.
- Total Airflow = 6 x Air flow of single fan = 9.66 m^3/min
- Total static pressure = Static pressure of single fan = 1280pa
- Airwatts = 206.08 AW which exceeds the ~100AW requirement for a Low pressure-High airflow system
The Filters
Types of filter used, component of second-hand smoke targetted
- HEPA (High-Efficiency Particulate Air) filter
- Mechanical filter that removes PM2.5, Tar, Ash, Nicotine droplets and more.
- Particles as small as 0.1 μm adhere to the filter’s fibers and are retained.
- Carbon filter
- Chemical filter that removes Volatile Organic Compounds (VOCs) such as formaldehyde, benzene and toluene.
- Activated carbon is highly porous and has a large surface area, providing ample space for particles to adhere to.
- Once all pores are saturated, the activated carbon filter must be replaced.
- Zeolite filter
- Chemical filter that removes water, ammonia, heavy metal, hydrogen sulfides, VOCs including Formaldehyde, Pyridine and Nitrosamines.
- Zeolites are crystalline microporous aluminosilicates. Its framework consists of corner-sharing XO4 tetrahedra where X are typically Si or Al atoms.
- Polar substances adsorb onto the zeolites in the same manner as on activated carbon.
The Inlet tubing
Listed are some considerations made when purchasing the tube.
- Tubing with an overly large diameter will affect the flow rate.
- Tubing has to be compressible so our product can remain compact when not in use.
- Tubing should be flexible and of sufficient length to be directed to the smokers’ nose and mouth, where smoke is exhaled