214

HV

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AL

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A

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pone

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of

the

cool

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and

heat

ing

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is

a re

sult

of t

he o

utsi

de a

ir t

hat

has

tobe

bro

ught

in to

ven

tilat

e a

spac

e. M

any

of th

e he

alth

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fa

cilit

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aces

ha

ve

spec

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re

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emen

tsre

gard

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min

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out

side

air

, m

anda

tory

req

uire

-m

ents

reg

ardi

ng t

he r

ate

of e

xhau

st a

ir,

and

man

da-

tory

re

quir

emen

ts

rega

rdin

g th

e pr

essu

rere

latio

nshi

ps

betw

een

room

s.

The

se

requ

irem

ents

mus

tbe

esta

blis

hed

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sign

crite

ria

base

dup

onth

e

mos

t di

ffic

ult

fact

or t

o de

term

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the

leas

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the

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e sp

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lied

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tion

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in-

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