diff --git a/rulesets/resources/301ruleset.rb b/rulesets/resources/301ruleset.rb
index fe2a63a57..3fe30c78b 100644
--- a/rulesets/resources/301ruleset.rb
+++ b/rulesets/resources/301ruleset.rb
@@ -2483,7 +2483,7 @@ def self.calc_rated_home_q_fans_by_system(orig_bldg, all_mech_vent_fans)
       # Check if supplemental balanced ventilation is needed
       # This should only happen when the home has no mechanical ventilation, because
       # otherwise the existing ventilation fans would have been increased instead.
-      if min_q_fan > q_fans.values.sum
+      if min_q_fan - q_fans.values.sum > 0.1
         q_fan_bal_remain = calc_rated_home_qfan(orig_bldg, true, 0.0)
       end
     end