Gentek 3980322, 3980423 Initial Certification, Re-Certification, Formaldehyde only, Ammonia only

Chapter 6: Maintaining Your Filtered Enclosure

Formaldehyde only

For formaldehyde, use 10% of the impregnated carbon weight. Formalin is 37% formaldehyde by weight. The density of formalin is 1.08 g/ml.

		Pounds of	Adsorbed weight of	Adsorption
Model		Formasorb	Formaldehyde	Volume of
Size	Filter Size	Carbon		Formalin
2'	18 x 18 x 1	7.0	0.7 lbs./318g	796 ml
3'	30 x 18 x 1	12.0	1.2 lbs./545g	1364 ml
4'	42 x 18 x 1	16.8	1.68 lbs./763g	1910 ml

Ammonia only

For ammonia, use 10% of the impregnated carbon weight. Assume use of a 50% solution of ammonia for these calculations.

		Pounds of		Adsorbed
		Ammonasorb		Volume of 50%
Model		II Carbon	Adsorbed weight of	Ammonia
Size	Filter Size		Ammonia	Solution
2'	18 x 18 x 1	9.2	0.92 lbs./418g	836 ml
3'	30 x 18 x 1	13.5	1.35 lbs./613g	1226 ml
4'	42 x 18 x 1	18.9	1.89 lbs./859g	1718 ml

Initial Certification

The filtered enclosure has been certified at the factory for an inflow velocity of 90±10 fpm along with the HEPA Filter Leak Test. The filtered enclosure should be certified for the proper inflow velocity required by your Safety Officer. It is also a conservative recommendation to perform the HEPA Filter Leak Test again should there be any damage caused during transport.

Re-Certification

Under normal operating conditions, the enclosure should be recertified at least annually if serviced. The certifier should perform the following tests.

•Inflow Velocity Test

•HEPA Filter Leak Test

In addition, the following tests should also be performed at the user’s discretion:

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