For best results, fill the balloons 1-2 hours before your event. Please CLICK HERE to view our BALLOON INFLATION CHART. As the inflated balloons touch the side of the armchairs please remove and tie the balloon with curling ribbon. Please make a sizer with 2 armchairs placed 9 in apart and place the helium gas tank underneath. The small disposable helium gas tank will inflate approx 30 of 9 in latex balloons or 15 of 11 in latex balloons or 12 of 18 in foil balloons. Capacity of each canister: 0.25 cubic metres.