Environmental Engineering Reference
In-Depth Information
FIgure 25.10
Exit.doors.that.swing.in.the.direction.of.emergency.travel.
An.exit.route.is.a.continuous.and.unobstructed.path.of.exit.travel.from.any.point.
within.a.workplace.to.a.place.of.safety..An.exit.route.consists.of.threes.parts:
.
1.. Exit.access.is.the.portion.of.the.route.that.leads.to.an.exit.
.
2.. Exit. is. the. portion. of. an. exit. route. that. is. generally. separated. from. other.
areas.to.provide.a.protected.way.of.travel.to.the.exit.discharge.
.
3.. Exit.discharge.is.the.part.of.the.exit.route.that.leads.directly.outside.or.to.a.street,.
walkway,.refuge.area,.public.way,.or.open.space.with.access.to.the.outside.
Normally,.a.workplace.must.have.at.least.two.exit.routes.to.permit.prompt.evac-
uation. of. their. employees. and. other. facility. occupants. during. an. emergency.. More.
than.two.exits.are.required.if.the.number.of.employees,.the.size.of.the.facility,.or.the.
arrangement.of.the.workplace.will.not.allow.a.safe.evacuation..Exit.routes.must.be.
located.as.far.away.as.practical.from.each.other.in.case.one.is.blocked.by.ire.or.smoke.
r
EquirEmEnts
for
E
xits
The.requirements.for.exits.are.as.follow:
•. Exits.must.be.separated.from.the.workplace.by.ire-resistant.materials;.that.
is,.a.1-hour.ire-resistance.rating.if.the.exit.connects.three.or.fewer.stories.
and.a.2-hour.ire-resistance.rating.if.the.exit.connects.more.than.three.loors.
•. Exits. can. have. only. those. openings. necessary. to. allow. access. to. the. exit.
from. occupied. areas. of. the. workplace. or. to. the. exit. discharge.. Openings.
must.be.protected.by.a.self-closing,.approved.ire.door.that.remains.closed.
or.automatically.closes.in.an.emergency.
