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What is the Difference Between Blow Through and Draw Through?


This blog was guest written by Chris Leach, Applications Engineer. There are two main non-recirculating direct gas-fired heater designs for commercial and industrial applications and those are blow-through and draw-through. The main difference in these two systems is the location of the blower relative to the burner. While a simple difference, blow-through units provide multiple benefits for large industrial space heating driven applications. Blow-through, as defined by the DOE (Department of Energy) as HTHV (High Temperature Heating & Ventilation) and employed in our S-Series heaters, places the blower before the burner and benefits from a higher LAT (Leaving Air Temperature) and temperature rise (∆T). HTHV units are not limited by the fan components in the hot airstream and can safely discharge at the maximum allowable limit for CSA certified direct fired applications. Draw-through units place the blower after the burner and have a lower LAT and ∆T due to limitations of the fan components in the hot air stream. Each of these systems has a specific purpose for large industrial spaces. For heating driven applications, maximizing the BTU to CFM ratio maximizes efficiency ...

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The Right Solution For Industrial Cooling Lies Somewhere Between DX Cooling And HVLS Fans


Evaporative cooling can provide significant temperature relief at a fraction of the cost of mechanical cooling. Industrial settings - with much exhaust airflow for contaminants and a substantial footprint - can struggle to achieve clean and temperate indoor air conditions without expensive mechanical cooling systems. However, the sheer size of many of these facilities prices that technology out of the possible solution set. On the other end of the cooling option spectrum, HVLS fans tend to move the hot air around, dependent on contact cooling for temperature relief. The moving air from HVLS fans can help employees feel more comfortable but cannot address internal heat gains within a facility nor provide temperature relief. Somewhere between those two options stands evaporative cooling technology, which provides tempered make-up air while also improving indoor air quality with the usage of 100% outdoor air.    Two-Stage Evaporative Cooling Technology Shines in Industrial Facilities The Cambridge ESC-Series evaporative cooling unit is a semi-custom fabricated air handler that can utilize direct (DEC), indirect (IEC) evaporative cooling, or a combination of both indirect/direct (two-stage) evaporative cooling to meet specific usage ...

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The Importance of Indoor Air Quality



Indoor air quality affects us daily, but we don't always consider it. We spend more than two-thirds of our time indoors, which means we're always breathing in air quality. This can have a significant impact on our health. Cambridge Air Solutions has over 60 years of experience in the industrial cooling industry, and we understand the importance of indoor air quality (IAQ). 

What is Indoor Air Quality? 

Indoor air Quality (IAQ) refers to the air quality in buildings and structures (EPA). Buildings with good IAQ have:

  • Ventilation
  • Control of Internal and External Pollutants
  • Comfortable Temperature
  • Comfortable Humidity Levels

Why is Good Indoor Air Quality So Important?

People spend more than two-thirds of their lives indoors, source. Poor indoor air quality can lead to long-term health issues, source. Good IAQ can also prevent the buildup of hazardous gases such as carbon monoxide. 

Increased Production

Employees need more than just a leather office chair to be comfortable. Air quality is often overlooked when thinking about employee comfort. If your employees aren't comfortable, chances are they are stressed out in the workplace. Employees that are comfortable in their workplace are much more productive employees. 

Slows the Spread of Viruses

Buildings with good IAQ are well-ventilated, which helps slow the spread of viruses such as COVID-19 and the Flu. This means less sickness in the workplace and a safer environment for your employees. A healthier workplace is also a wealthier workplace, according to a Harvard study. Better health leads to less sick leave and more productivity, which leads to greater profits. Good IAQ in your building can also reduce allergy or asthma triggers. There are more pollutants in the air when IAQ is low due to poor ventilation. This can cause some diseases, such as asthma, to flare up. 

How to Improve Indoor Air Quality

Invest in your employees with a system from Cambridge Air Solutions. We are a leading manufacturer of commercial and industrial heating, ventilation, and evaporative cooling products. Both our S-Series and SA-Series utilize 100% fresh air to dilute contaminants. This eliminates many of the air quality problems associated with traditional heating systems that recirculate indoor air. Similarly our M-Series offers superior IAQ as it uses only fresh air from outside and noes not recirculate contaminated indoor air. Our ESC-Series also uses 100% outside air to provide tempered make-up air and building cooling. 


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With the right air quality management system, you can breathe easy. You and your employees will be able to spend more time indoors without worrying about potential health problems caused by poor indoor air quality. To learn more about Cambridge Air Solutions products for improving your indoor air quality, contact a rep today.