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There are better setups than the 20" box fan + MERV furnace filter. For example check out this similar DIY design that reduces risk of an electrical fire by mak

There are better setups than the 20" box fan + MERV furnace filter. For example check out this similar DIY design that reduces risk of an electrical fire by making it easier for the fan to draw air: https://encycla.com/Corsi-Rosenthal_Cube https://encycla.com/Corsi-Rosenthal_Cube

rovr138 5y ago
From that page, >The EPA funded a study by Underwriters Laboratories (UL) which tested box fans with MERV-13 filters attached, finding them to not present a fire hazard even in extreme, modified conditions. Then it links to, https://chemicalinsights.org/wp-content/uploads/DIY-Box-Fan-Report-2021.pdf?utm_source=Chemical+Insights&utm_campaign=d52ba63ea8-July_2021_Newsletter7_13_2021_13_4&utm_medium=email&utm_term=0_09fecf83d2-d52ba63ea8-119531236 https://chemicalinsights.org/wp-content/uploads/DIY-Box-Fan-... which says, >Two-Sided Obstruction >Figure 6 shows the time series of monitored temperatures under extreme condition where both sides of the fans were blocked. Despite the severe blockage of air flow, temperatures of all five box fans peaked within the first 20 minutes and then plateaued, remaining steady for the remaining 7 hours. Winding temperatures had the largest relative increase of 30 to 57 °C above ambient temperature, with peak absolute winding temperatures remaining at or below 80 °C. Peak temperatures on other fan parts did not exceed 50 °C. > Temperatures at the power cord, guard, and switch, remained close to ambient room temperature (±6 °C) during all filter test scenarios as well as during the one-sided blocked tests. For the two-sided blocked tests, temperatures at the power cord, guard, and switch increased initially before plateauing to a steady temperature for the remainder of the 7-hour test duration. All fans remained operational for the 7-hour test duration and did not show any signs of potential hazard or damage.

rovr138 5y ago

From that page, >The EPA funded a study by Underwriters Laboratories (UL) which tested box fans with MERV-13 filters attached, finding them to not present a fire hazard even in extreme, modified conditions. Then it links to, https://chemicalinsights.org/wp-content/uploads/DIY-Box-Fan-Report-2021.pdf?utm_source=Chemical+Insights&utm_campaign=d52ba63ea8-July_2021_Newsletter7_13_2021_13_4&utm_medium=email&utm_term=0_09fecf83d2-d52ba63ea8-119531236 https://chemicalinsights.org/wp-content/uploads/DIY-Box-Fan-... which says, >Two-Sided Obstruction >Figure 6 shows the time series of monitored temperatures under extreme condition where both sides of the fans were blocked. Despite the severe blockage of air flow, temperatures of all five box fans peaked within the first 20 minutes and then plateaued, remaining steady for the remaining 7 hours. Winding temperatures had the largest relative increase of 30 to 57 °C above ambient temperature, with peak absolute winding temperatures remaining at or below 80 °C. Peak temperatures on other fan parts did not exceed 50 °C. > Temperatures at the power cord, guard, and switch, remained close to ambient room temperature (±6 °C) during all filter test scenarios as well as during the one-sided blocked tests. For the two-sided blocked tests, temperatures at the power cord, guard, and switch increased initially before plateauing to a steady temperature for the remainder of the 7-hour test duration. All fans remained operational for the 7-hour test duration and did not show any signs of potential hazard or damage.