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7300 WEST 147TH STREET SUITE 504 APPLE VALLEY, MN 55124-7580 (952) 431-4433 MEMORANDUM: PROJECT: CNH NO: DATE: TO: SUBJECT: Lino Lakes Fire Station 14045 February 24, 2015 City of Lino Lakes - Mayor and City Council Alternate #5 Background Information 027 The following is a summary of the information related to review of Alternate #5 High Speed Coiling Doors instead of Four -Fold Doors for City Council consideration for the Lino Lakes Fire Station project. CNH Architects has provided additional review and information for use by the City Council in considering this item. Alternate #5 is a deduct to provide high speed coiling doors at the apparatus bays instead of four -fold doors indicated in the base bid. The four -fold door system was designed originally as the only approach for this project but the high-speed coiling doors were added as requested during the bidding process as an alternate for consideration by Council. Operation: Both doors systems provide the operational benefits that are important for a fire station, quick opening and closing allowing for faster response time and less risk of fire apparatus hitting the door in the urgency of leaving the building on a call. Slower opening sectional overhead doors are much more likely to be hit damaging the door and apparatus. While four -fold doors are easier to operate manually in the case of a power failure than high speed coiling, this is not an issue for this facility since the doors will be connected to the emergency backup generator. Maintenance: In our opinion, the maintenance on both door types should be very low. We have installed five four- fold doors at the Roseville Fire Station and they have been very pleased with their operation for the past 18 months of operation. We have also installed high-speed coiling doors at an auto dealership (a common use of this door type) and the record for low -maintenance operation is very good as well. CNH Architects is also aware of concerns that the Eagan Fire Department has had with the four -fold doors that were installed at their Fire Safety Center where they have had a lot of adjustments and several maintenance issues. It is hard to determine how representative the Eagan project is as the doors were specified incorrectly by that projects design firm, disassembled totally twice for factory painting, reassembled each time and then reinstalled. There are over 20 fire stations in the Twin Cities that have four -fold door installations while high-speed coiling doors have not been installed locally in any fire stations. They have however been installed in dozens of other uses locally include many auto dealerships as noted earlier as well as fire stations in other parts of the country. Energy Efficiency: The four -fold door and high-speed coiling doors have been compared for their thermal values. Four- fold doors have a typical U -value of 0.45 for a door based on an insulated door panel and 1" P:\PROJECTS\2014\14045\4 - BIDDING\ALTERNATE #5 RECOMMENDATIONS.DOCX