RE: timers on ventilation systems

[Guest guest]

We recommend that buildings be provided with a minimum of one and three air changes of outside

air prior to building occupancy to remove contaminants and odors that have

built up during the night when the building ventilation system is turned off.

The exact amount of outdoor air required to purge the building to an acceptable

concentration of contaminants will depend upon the specific sources in the

building and can be determined on a trial basis using building odor as a

criteria.So if the system is a minimum outdoor air system providing say 1 air change per hour of outdoor air, then to get the 1 to 3 air changes will require between 1 and 3 hours operation prior to occupancy. If the system can be operated at 100% outdoor air, say 6 air changes per hour of outdoor air then to get the 1 to 3 air changes will require between 10 minutes and 30 minutes operation prior to occupancy.

Bud Offermann PE CIHIndoor Environmental Engineering1448 Pine Street, Suite 103San Francisco, CA 94109Office:Cell:Fax: E-mail: Offermann@...Web Site: http://www.IEE-SF.com

Can anyone point me to some good guidance documents on the issue of what time to start introducing the required amount of outdoor air in the mornings? ASHRAE

seems to only require the minimum outdoor air during occupancy. But my concern is build-up of VOCs overnite. I am dealing with a new office building that shuts the ventilation off after 5 pm. A few occupants experiencing irritation/asthma soon after starting

work.

From: iequality [mailto:iequality ]

On Behalf Of pcochrane77

Sent: Sunday, April 29, 2012 10:20 AM

To: iequality

Subject: New Video about Penicillium

Exposure Risks Associated with Penicillium Discussed in New Online Video

or www.IAQTV.com

PR: http://prlog.org/11861890

Over 166,000 IAQ Video Network downloads to date.

Sincerely,

Cochrane

President

Cochrane & Associates, LLC

www.cochraneassoc.com

IAQ Video Network

www.IAQTV.com

[Guest guest]

That’s great. Makes sense. You haven’t seen it in writing anywhere, have you, other than your reports? I’d like to quote something.

From: iequality [mailto:iequality ]

On Behalf Of Bud Offermann

Sent: Monday, April 30, 2012 2:59 PM

To: iequality

Subject: Re: timers on ventilation systems

We recommend that buildings be provided with a minimum of one and three air changes of outside air prior to building occupancy to remove contaminants and odors that have built up during the night when the building ventilation system is turned off. The exact

amount of outdoor air required to purge the building to an acceptable concentration of contaminants will depend upon the specific sources in the building and can be determined on a trial basis using building odor as a criteria.

So if the system is a minimum outdoor air system providing say 1 air change per hour of outdoor air, then to get the 1 to 3 air changes will require between 1 and 3 hours operation prior to occupancy. If the system can be operated at 100%

outdoor air, say 6 air changes per hour of outdoor air then to get the 1 to 3 air changes will require between 10 minutes and 30 minutes operation prior to occupancy.

Bud Offermann PE CIH

Indoor Environmental Engineering

1448 Pine Street, Suite 103

San Francisco, CA 94109

Office:

Cell:

Fax:

E-mail:

Offermann@...

Web Site:

http://www.IEE-SF.com

Can anyone point me to some good guidance documents on the issue of what time to start introducing the required amount of outdoor air in the mornings? ASHRAE seems to only require the minimum outdoor air during occupancy.

But my concern is build-up of VOCs overnite. I am dealing with a new office building that shuts the ventilation off after 5 pm. A few occupants experiencing irritation/asthma soon after starting work.

From:

iequality [mailto:iequality ]

On Behalf Of pcochrane77

Sent: Sunday, April 29, 2012 10:20 AM

To: iequality

Subject: New Video about Penicillium

Exposure Risks Associated with Penicillium Discussed in New Online Video

or

www.IAQTV.com

PR: http://prlog.org/11861890

Over 166,000 IAQ Video Network downloads to date.

Sincerely,

Cochrane

President

Cochrane & Associates, LLC

www.cochraneassoc.com

IAQ Video Network

www.IAQTV.com

[Guest guest]

Who do you hire to get a good ventilation system, or is this just for commercial

buildings?

>

> We recommend that buildings be provided with a minimum of one and three air

changes of outside air prior to building occupancy to remove contaminants and

odors that have built up during the night when the building ventilation system

is turned off. The exact amount of outdoor air required to purge the building to

an acceptable concentration of contaminants will depend upon the specific

sources in the building and can be determined on a trial basis using building

odor as a criteria.

>

> So if the system is a minimum outdoor air system providing say 1 air change

per hour of outdoor air, then to get the 1 to 3 air changes will require between

1 and 3 hours operation prior to occupancy. If the system can be operated at

100% outdoor air, say 6 air changes per hour of outdoor air then to get the 1 to

3 air changes will require between 10 minutes and 30 minutes operation prior to

occupancy.

>

>

>

> Bud Offermann PE CIH

>

> Indoor Environmental Engineering

> 1448 Pine Street, Suite 103

> San Francisco, CA 94109

> Office:

> Cell:

> Fax:

> E-mail: Offermann@...

> Web Site: http://www.IEE-SF.com

>

>