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Test Your Knowledge
Every so often we will publish a "Test Your Knowledge" question, about issues relating to home ownership and the construction-related fields.  The first person to e-mail us with the correct answer will receive a gift certificate, good towards the purchase of a Home Inspection through DSP.

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The first person to e-mail us with the correct answer(s) will receive a $20.00 gift certificate good towards the purchase of a Home Inspection, through DSP Structural Consultants.



Current "Test Your Knowledge" Question

"Which Federal Governmental Agency Regulates

Indoor Air Quality In U.S. Homes?"


  • EPA - Environmental Protection Agency
  • OSHA - Occupational Safety and Health Administration
  • CPSC - Consumer Product Safety Commision
  • USEHB - United States Environmental Health Board



Answers To Last "Test Your Knowledge" Question

"What Potential Safety Problems Are Present

In The Photograph Below?"

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Answers Below:

  1. Dryer vent pipe is "flex-style" plastic.  This type of vent pipe is not recommended for use due to:  a). its ability to hold lint, and   b). it is made out of plastic & can burn.   Recommend using continuous smooth metal piping, as per the lower portion of the dryer vent.

  2. Dryer vent pipe is using a "lint sock" in an effort to re-capture warm, moist air from the dryer and return it back into the house.  Note that the clothes dryer's fuel source is natural gas (see item marked #5).  During operation, the gas dryer will emit carbon monoxide as a by-product of combustion, which can be blown out the lint sock, throughout the house.   For safety, this type of fuel burning appliance must be direct-vented to the outside.

  3. Note the separation between the clothes dryer vent pipe (item marked #1), and the fresh-air, or make-up air vent (item marked #4).   In this case the separation is only 16-20 inches.  Minnesota requires at least a 3'-0" separation between these two types of vents, and the Uniform Mechanical Code goes even farther and specifies a 10'-0" separation.  The reason is simply this:   If the fresh-air vent is placed in too close a proximity to a vent that is exhausting carbon monoxide (a fossil-fuel burning appliance), the carbon monoxide can be drawn back into the house through the fresh-air vent, creating an obvious safety hazard.


Respondent Results:

Out of over 75 responses, six individuals answered the above question more or less correctly, and received a $20 gift certificate from DSP.






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