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2. Useful conversions and formulas for air dispersion modeling

   en.wikipedia.org/wiki/Useful_conversions_and...

   A normal cubic meter (Nm 3) is the metric expression of gas volume at standard conditions and it is usually (but not always) defined as being measured at 0 °C and 1 atmosphere of pressure. A standard cubic foot (scf) is the USA expression of gas volume at standard conditions and it is often ( but not always ) defined as being measured at 60 ...

3. Air pollutant concentrations - Wikipedia

   en.wikipedia.org/wiki/Air_pollutant_concentrations

   Environmental agencies in the USA often use the terms "dscf" or "scfd" to denote a "standard" cubic foot of dry gas. Likewise, they often use the terms "dscm" or "scmd" to denote a "standard" cubic meter of gas. Since there is no universally accepted set of "standard" temperature and pressure, such usage can be and is very confusing.

4. Threshold limit value - Wikipedia

   en.wikipedia.org/wiki/Threshold_limit_value

   Its units are in parts per million (ppm) for gases and in milligrams per cubic meter (mg/m 3) for particulates such as dust, smoke and mist. The basic formula for converting between ppm and mg/m 3 for gases is ppm = (mg/m^3) * 24.45 / molecular weight. This formula is not applicable to airborne particles.

5. Air changes per hour - Wikipedia

   en.wikipedia.org/wiki/Air_changes_per_hour

   Vol = Space volume L × W × H, in cubic feet; In metric units = where: ACPH = number of air changes per hour; higher values correspond to more ventilation; Q = Volumetric flow rate of air in liters per second (L/s) Vol = Space volume L × W × H, in cubic meters

6. Download and install System Mechanic - AOL Help

   help.aol.com/articles/how-do-i-download-and...

   Visit the System Mechanic detail page. Click Try It Free. If prompted sign in. Enter you billing details. Click Start my free trial. Click Get started. Follow the on-screen instructions to begin using your product. A confirmation email from AOL Premium Subscription or one of our partners will be sent to your email account.

7. Clean air delivery rate - Wikipedia

   en.wikipedia.org/wiki/Clean_Air_Delivery_Rate

   The clean air delivery rate (CADR) is a figure of merit that is the cubic feet per minute (CFM) of air that has had all the particles of a given size distribution removed. For air filters that have air flowing through them, it is the fraction of particles (of a particular size distribution) that have been removed from the air, multiplied by the ...