Los Angeles County Municipal Code Part 8 Surface Coating Process Ventilation Systems

A.

For spray booths at which the operator remains outside the booth, the minimum face velocity shall be 150 fpm and the minimum air flow into the booth shall be at a rate of 150 cfm per square foot of open booth face.

B.

For booths where the operator and work are located within the booth, the minimum face velocity shall be 100 fpm and the minimum flow rate 100 cfm per square foot of open booth face.

C.

Where spraying is done over a downdraft ventilation system, the minimum control velocity shall be 100 fpm.

D.

The size of the grill shall be larger than the object being sprayed, and the entire object being sprayed shall rest over the grill area.

E.

Workers engaged in spraying out of doors shall be provided with and required to wear approved respiratory protective devices.

(Ord. 8588 § 9 (part), 1964; Ord. 7583 Part 3 Ch. 16 § 1175, 1959.)

Spray booths shall be of a size and design to adequately protect workers within and outside thereof against unnecessary exposure to such material, and all items being sprayed shall be placed far enough within and otherwise be so located in the booth to effectively remove vapor and overspray.

(Ord. 8588 § 9 (part), 1964; Ord. 7583 Part 3 Ch. 16 § 1181, 1959.)

A.

The fan shall have sufficient capacity to exhaust the necessary volume of air to meet requirements of this Division 1 against a static pressure equivalent to all resistances to be overcome in operating the unit.

B.

The ducts shall be designed for a velocity of not less than 1,500 fpm and not more than 2,200 fpm, except for metalizing booths, where the velocity shall not be less than 3,000 fpm.

C.

The discharge from the ventilation system shall extend to at least two feet above the roof level and be so directed as to not cause vapors or fumes to enter the work area.

D.

Baffles or filters shall be installed in the booth as may be necessary to provide proper and effective air distribution.

E.

Provision shall be made for admitting a supply of air to a room in which an exhaust system is located that is equal or slightly greater than that amount being exhausted.

(Ord. 8588 § 9 (part), 1964; Ord. 7583 Part 3 Ch. 16 § 1182, 1959.)

A.

For air-atomized electrostatic spray booths, the minimum face velocity shall be 100 fpm and the volume of air exhausted shall be 100 cfm per square foot of face opening or of grill area in the case of a downdraft exhaust system.

B.

The minimum inlet ventilation-air velocity for airless atomized electrostatic spray booths shall be 75 fpm, and the volume of such air shall be 75 cfm per square foot of face opening or of grill area for a downdraft exhaust system.

C.

Use of portable electrostatic spray guns in a building shall be only in a booth or area provided with local exhaust ventilation providing a minimum capture velocity of 75 fpm at the point of use.

(Ord. 8588 § 9 (part), 1964; Ord. 7583 Part 3 Ch. 16 § 1176, 1959.)

A.

Spray booths in which airless spray units are used shall have a minimum face velocity of 100 fpm and a minimum flow rate of 100 cfm per square foot of open booth face.

B.

Use of portable electrostatic spray guns in a building shall be only in a booth area provided with local exhaust ventilation providing a minimum capture velocity of 100 fpm at the point where such spray unit is used.

(Ord. 8588 § 9 (part), 1964; Ord. 7583 Part 3 Ch. 16 § 1177, 1959.)

A.

Spraying with highly toxic metals such as lead, beryllium, low-tin babbit and cadmium shall be done only within a suitable spray booth. Both the material being sprayed and the workers doing the spraying shall be positioned within the booth to minimize worker exposure to such materials. Metals with a toxicity comparable to zinc, bronze or copper may be sprayed in a suitable spray booth or hood. Nontoxic materials need not be sprayed in a booth or under a hood except as to maintain reasonably proper working condition.

B.

Spray booths and hoods used for metal spraying shall have a minimum face velocity of 200 fpm and a minimum flow rate of 200 cfm per square foot of open booth face.

C.

Workers involved in spraying either highly toxic materials or toxic materials for such periods as may produce a health hazard shall be supplied with and required to wear Bureau of Mines-approved supplied-air respirators, and required to wear adequate protective clothing and gloves.

(Ord. 8588 § 9 (part), 1964; Ord. 7583 Part 3 Ch. 16 § 1179, 1959.)

Flow coating operations shall he done within an enclosure, with a minimum face velocity of 100 fpm and a minimum flow rate of 100 cfm per square foot of open face.

(Ord. 8588 § 9 (part), 1964; Ord. 7583 Part 3 Ch. 16 § 1178, 1959.)

A.

All dip tanks, or the room in which the tank is located, shall be equipped with a mechanical exhaust ventilation.

B.

Dip tanks which are equipped with local exhaust ventilation shall exhaust air at the rate of 100 cfm per square foot of tank area.

C.

Where general ventilation is used, there shall be a minimum of 12 air changes per hour, ventilating all occupied areas of the room.

D.

Where paint-dipped parts are air dried and local exhaust ventilation is not provided, general ventilation shall be provided and the minimum quantity of air exhausted shall be as required by recognized national standards, as stated in the Rules and Regulations.

(Ord. 8588 § 9 (part), 1964; Ord. 7583 Part 3 Ch. 16 § 1180, 1959.)