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Removes nearly 2 times more contaminants.
One time upgrade for a lifetime of improvement.
Aprilaire Upgrade Kit 1413 installs in minutes with no tools required.
Easy-to-change filter system.
Aprilaire Upgrade Kit 1413 includes replacement filter #413.
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Imported from USA.
Aprilaire 1413 Upgrade Kit For Aprilaire Models 2400 And
2140Features: Upgrade your Aprilaire Model 2400 or 2140 so that
it can remove nearly 2 times more contaminants.One time upgrade -
lifetime improvementInstalls in minutesNo tools requiredEasier
filter changeIncludes Aprilaire Model 413 (replacement filter)
and fits in units produced after 1985.