HomeMy WebLinkAboutB14-0108 REV1 Mechanical Letter.pdf
7/22/14 Potato Patch Club Page 1 of 1
PO BOX 8610 • AVON, CO 81620 • Telephone 970-845-7910
Fax 970-845-7522 • E-mail drader@raderengineering.com
7/22/14
Mr. Brent Crouch
Victor Mark Donaldson Architects
Box 5300
Avon, CO 81620
RE: Potato Patch Club
Ducts near Units 31 and 32
Keystone, CO
REI Job No. 14061.00
Dear Brent,
I have investigated the large 20 inch diameter duct and combustion air grille which terminates
under the stairs near the entry to Unit 32. The existing heating system for Unit 32 is electric and
there are no combustion air requirements for this Unit. Unit 31 has a gas fired boiler and water
heater with a combined input of 625,000 Btu/hr. There is also an indoor pool in Unit 31 which
has a pool dehumidification system that was upgraded in 1997.
The 20 inch diameter duct does not connect to any equipment in either Unit 31 or 32 and this
duct appears to be a remnant of a previous pool dehumidification system. It is my opinion that
this duct is not required and can be capped and abandoned in place.
The combustion air for Unit 31 is drawn through a large grate at grade into an area well and
through two permanent openings into the mechanical room. Calculating the combustion air
requirements based on the 2012 International Fuel Gas Code, there must be a minimum opening
of 312 square inches in order to not restrict the combustion air path. Your proposed screen wall,
along with the open tread stairs shown on Sheet A6.4 dated 7/23/14, far exceed this requirement.
Please call with any questions.
Sincerely,
J. Drew Rader P.E.
7/22/14