Know the Difference Between HTHV and 80/20 Technologies – It Makes a Difference To Your IAQ!

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For years High Temperature Heating and Ventilation (HTHV), a direct-fired 100% outside air technology, and 80/20 direct-fired units have been heating solutions used for new construction and retrofit projects throughout the US with little attention to the differences in Indoor Air Quality (IAQ) from both products. However, when it comes to IAQ there are significant differences between these two technologies – HTHV being the clear winner.

The Occupational Safety and Health Administration (OSHA) was created to assure safe and healthful working conditions for working men and women by setting and enforcing standards and by providing training, outreach, education and assistance1.

Among the frequently asked questions on the OSHA website is one concerning IAQ:

What is considered good IAQ?

The qualities of good IAQ should include comfortable temperature and humidity, adequate supply of fresh outdoor air, and control of pollutants from inside and outside of the building2.

It is these pollutants, and the amount of the pollutants in parts per million (PPM), that differentiate 100% outside air HTHV technologies apart from 80/20 units. Both OSHA and the Canadian Standards Association (CSA) set limits on what the acceptable PPMs for different pollutants are for working environments. The performance and safety standards set by the American National Standards Institute (ANSI) are z83.4 for 100% outside air non-recirculating direct gas-fired industrial air heaters and z83.18 for 80/20 recirculating direct gas-fired industrial air heaters. The infographic below helps illustrate the differing amount of pollutants in PPM between HTHV and 80/20 units along with the acceptable limits for these pollutants in both the US and Canada.

1 Reference OSHA website: www.osha.gov/about.html
2 Reference OSHA website: www.osha.gov/OSHA_FAQs.html

4 TIPS FOR PLANNING YOUR COMMERCIAL HEATER LAYOUT TO MAXIMIZE ENERGY EFFICIENCY AND IAQ

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Did you know that part of the Cambridge package includes a free and customized recommendation on unit placement in your facility? Our experts Denny DeGreeff and Mark Struckmann offer up some tips to consider when planning for ultimate Indoor Air Quality and Comfort using commercial heaters.

4 TIPS FOR PLANNING YOUR COMMERCIAL HEATER LAYOUT 

1. Consider your facility layout.

Locate the heaters near the perimeter of the building, blowing towards the center. Due to the high velocity discharge of a Cambridge heater, you might be able to locate the heaters near a gas main to save on piping costs. 

2. Find your source of Heat Loss.

Place the units near largest source of heat loss, typically dock doors. This can eliminate the need for extra heating equipment such as infrared tubes and door heaters. Also, make sure the heat from your unit can reach the floor (Refer to the Typical Discharge Height Chart in your Engineering Spec manual as a guideline).

3. Note Obstructions.

You do not want to blow directly in to an obstruction such as a rack or interior wall.  If the racking layout allows, align the heater up with an aisle and blow lengthwise. 

4. Adapt the heater configuration to work for your space.

Cambridge heaters can be customized to almost any building structure and installation requirement. If you have limited space inside the building for heater install, consider a different type of configurations, such as a vertical or roof-top installation. 

Economical, Efficient, and Cost Effective

That’s why Patten CAT prefers Cambridge Engineering products

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Patten CAT is a 4th generation Caterpillar sales and service organization that began back in 1933. Their relationship with Cambridge Engineering heating products started in 2005 when they purchased their first Cambridge S-Series unit to retrofit a less efficient heating system at their Oglesby, IL location. Fast forward 12 years later and Patten has over 25 Cambridge units heating 6 of their locations throughout the Chicagoland area.

  • Oglesby, IL –  5 Cambridge s-series units
  • Wauconda –  2 Cambridge S-Series units
  • Rockford – 5 Cambridge S-Series units
  • Hammond – 4 Cambridge S-Series units
  • Joliet – 1 Cambridge S-Series unit
  • Elmhurst – 7 Cambridge S-Series units and 1 Cambridge M-Series unit

In the beginning the units were purchased to retrofit older less efficient heating units which were not as effective in heating their facilities. Today they have used the Cambridge units to not only retrofit their existing locations, with the latest retrofit qualify for NiCor gas energy efficiency rebate, but to heat their location in Wauconda, IL which was a new construction project.

For Terry Flick, Patten’s facility manager, Cambridge is his go-to heating products for Patten facilities. According to Flick, “Cambridge units are long lasting and are economical enough for people to purchase. Whenever I have to update something I keep going back to Cambridge.”

There are other benefits that Patten realizes from using Cambridge equipment. Since the units are a 100% outside air heating technology the units help provide a little positive pressurization for their buildings. This helps keep the cold air out and improves the indoor air quality for their employees during the winter heating months.

As Flick points out, “even on a zero-degree day the units still provide a 160-degree Fahrenheit discharge temperature which keeps our facilities nice and warm.” The other competitor’s units struggled to achieve a 60-degree discharge air temperatures when the outside temperature drops down to zero. And with their many Chicagoland locations they see quite a few zero degree days during the Chicago winters.

Cambridge is honored to be the heating solution of choice for Patten CAT and we hope to continue our relationship with Patten for many years to come.