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12 ach isn't enough for isolation rooms ..... min 15 ach ..... and w/ 150 cfm differential ...... sealed walls/windows ..... and door w/ tight gasket as far as insulting ...... the way you can across .... ok mr cme ..... that doesn't sound professional at all

i would vent each chiller independently ...... agreeing with lilliput

check w/ your elec engineer with nec for clearances required for their gear personally, i would not run it over electrical gear

input (to the panel) output (from the panel) digital - contact closure analog - modulation

you can get up to 130 degf disharge temp w/ gas heat use a down and dirty cost-wise system ...... packaged rooftop unit, constant volume with programmable stat

ashrae 90.1-2004 6.5.2.1 exception b i would cringe on using vav regarding infection control

atlas, you are one arrogant person who recommends his own threads as helpful you are incorrect in your statements

vav can be used in administration and kitchen patient rooms are typically fan coil units with a dedicated makeup air unit for osa ventilation treatment is cv reheat pressure differential is established via the difference between supply and return/exhaust ...... 75 cfm in most cases

the door to the isolation room is closed in design show me where cv reheat is in violation for healthcare

calculate the pressure from the static height of the highest point to the expansion tank then add 3 psi you should also be pumping away from the boilers the expansion tank is connected to the suction side of the pump via the air separator (rolairtrol) b&g has a program to calculate expansion...

atlas, all new healthcare projects are cv reheat ..... vav boxes set to constant cfm with vav you cannot maintain pressure relationships better think thru that again large healthcare is the vast majority of my work

100 ach is no problem as i have engineered systems n the past ..... use anemostat hcr diffusers mounted perpendicular to the hoods

in a nutshell: all systems are constant volume reheat no duct liner solid double wall units ducted returns 75 cfm differential for + and - spaces ..... use aia guidelines to determine what room requires some states have their own guidelines ..... like florida

Which do you specify for chilled and hot water systems?

trane has details for draw thru and blow thru on their website

i specify paco

The acceptance testing is in NFPA-90A

Is actual commissioning of fire, F/S and smoke dampers involve whether they close w/o binding or is it just installation checks such as for sleeve clearance, breakaway connections, access doors, etc?

is there a volume damper in the neck? if so move it to the takeoff and use max 5' flex duct installed non-kinked ..... i spec buckley atmd w/ extended neck option what application is the location ..... hard room surfaces? ..... office environment? this post assumes similar noise levels w/...

inlet guide vanes are 80's technology vfd's will help with fan acoustics also drives are so cheap these days compared to say 10 years ago does the unit have final filters? what position are the vanes in now at full load cooling and dirty filters?