Retrotec USACE - Manual (Page 239)

Appendix D D109
D169). This saves energy, since less outdoor supply air is needed to satisfy the
makeup air requirements.
D.7.1.5 Use of High-Pressure Spray Guns (Ineffi ciency)
Figure D170. High-pressure compressed-air
paint gun.
Paint can be applied to a part by high-pressure compressed-air spray guns,
low-pressure compressed-air spray guns, or an airless gun. The use of a high-
pressure gun (Figure D170) creates a large amount of small paint particulates,
some of which do not reach the part being painted. These guns also create tur-
bulent conditions in the paint booth, making it more diffi cult to capture these
airborne contaminants.
D.7.1.6 Operations That Are Not Enclosed Requiring Excessive
Ventilation and Movement of Paint Fumes into Adjacent Spaces
(Waste)
Figure D171. Paint operations
occurring in a partially enclosed paint
booth requiring excessive exhaust to
contain paint fumes.
During the painting operation, the paint fumes and airborne paint parti-
cles must be captured and removed from the space for safety and health
reasons. Performing the painting operation in a booth greatly reduces the
exhaust air fl ow to accomplish this removal. If the painting operations take
place outside a booth (Figure D171), then a greater air fl ow must be ex-
hausted to provide proper control of these contaminants. Such a situation
is ineffi cient, with an excessive use of energy required for the same level of
safe conditions.