Ohio Administrative Code › Title 4123:1 - Division of Safety and Hygiene › Chapter 4123:1-3 - Construction › Section 4123:1-3-18 - Heating, ventilating and exhaust equipment

Current through all regulations passed and filed through July 1, 2024
(A) Scope.
This rule relates to methods of
				controlling air contaminants (as defined in paragraph (B) of this rule) which
				have been established as hazardous.
(B) Definitions.
(1) "Air contaminants" as used in this rule,
			 means 
									airborne concentrations of fibrosis-producing or toxic
			 dusts, toxic fumes, toxic mists, toxic vapors, or toxic vapors, or toxic gases,
			 or a combination of these.
(2)
			 "Collector" - see "separator."
(3)
			 "Confined space" means any tank, vessel, container, or pit so enclosed that
			 adequate ventilation is not obtained by natural air movement.
(4) "Duct" means any pipe, flue, or channel
			 forming a part of a ventilating system used to convey air, dusts, fumes, mists,
			 vapors, or gases.
(5) "Dust" means
			 
									solid particulate matter, other than fumes,
			 generally less than one hundred
			 micrometers in aerodynamic diameter.
(6) "Exhaust system" means a complete suction
			 system, including all hoods, ducts, fans, separators, and receptacles, when
			 required, and any other part necessary for the proper installation and
			 operation thereof.
(7) "Fan" means
			 the equipment which creates the movement of air in a mechanical system of
			 ventilation.
(8) "FPM" means the
			 rate of lineal air movement in feet per minute.
(9) "
									Fume means
			 solid 
									particulates generated by the condensation 
									of vapors or
			 gases, usually of metallic elements
			 .
(10) "Gas"
			 means a formless fluid occupying the space of enclosure.
(11) "Hazardous concentrations" as applied to
			 air contaminants, means concentrations which are known
			 
									of recognized occupational exposure limits such as, but
			 not exclusively, the OSHA permissible exposure limits (OSHA-PEL), national
			 institute for occupational safety and health recommended exposure limits
			 (NIOSH-REL) or American conference of governmental industrial hygienists'
			 threshold limit values (ACGIH)TLV®).
(12) "Hood" means that part of an exhaust
			 system into which  air
			 contaminants
									 first enter.
(13) "Mist" means liquid droplets or wet
			 solids suspended in air.
(14)
			 "Separator (collector)" means that part of an exhaust system,
			 
									designed to separate the entrained material from
			 the conveying air .
(15) "Vapor" means the gaseous form of a
			 substance normally in the liquid or solid state.
(16) "Velocity" means:
(a) "Capture velocity" means the velocity at
			 any point in front of the hood necessary to overcome the opposing air currents
			 and to capture the contaminated air by causing it to flow into the exhaust
			 hood.
(b) "Duct velocity" means the
			 velocity of air  in a duct.
(c) "Transport velocity" means the velocity
			 of air required to keep the material 
										entrained in the
			 conveying air.
(17) "Ventilation" means:
(a) "Dilution ventilation" means ventilation
			 provided to reduce the concentration of air contaminants in the atmosphere of
			 all of or part of the place of employment.
(b) "General ventilation" means ventilation
			 of the general atmosphere in the place of employment.
(c) "Local exhaust ventilation" means that
			 type of ventilation in which suction is applied at the point of generation or
			 escape of air contaminants.