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Natural Gas (Henry Hub) Last-day Financial Futures Contract Specs

Contract Unit 10,000 million British thermal units (mmBtu).
Price Quotation U.S. dollars and cents per mmBtu.
Trading Hours CME Globex: Sunday - Friday 6.00 p.m. - 5:15 p.m. (5.00 pm. - 4.15 p.m. Chicago Time/CT) with a 45-minute break each day beginning at 5.15 p.m. ( 4:15 p.m. CT) Trade is Flow per day or Flow per month.
CME ClearPort: Sunday - Friday 6.00 p.m. - 5:15 p.m. (5.00 pm. - 4.15 p.m. Chicago Time/CT) with a 45-minute break each day beginning at 5.15 p.m. ( 4:15 p.m. CT) Trade is Flow per day or Flow per month.
Open Outcry: Monday - Friday 9:00 a.m. - 2:30 p.m. (8:00 a.m. - 1.30 p.m. CT)
Minimum Price Fluctuation $0.001 per mmBtu
Product Code Clearing: HH
TAS: HHT
Listed Contracts The current year and the next five years. A new calendar year will be added following the termination of trading in the December contract of the current year.
Settlement Method Financially Settled
Floating Price The Floating Price for each contract month will be equal to the NYMEX (Henry Hub) Natural Gas
Futures contract final settlement price for the corresponding contract month on the last trading day
for that contract month.
Trade At Marker Or Trade At Settlement Rules Trading at settlement is available for spot (except on the last trading day), 2nd and 3rd months and subject to the existing TAS rules. Trading in all TAS products will cease daily at 2:30 PM Eastern Time. The TAS products will trade off of a "Base Price" of 0 to create a differential (plus or minus 10 ticks) versus settlement in the underlying product on a 1 to 1 basis. A trade done at the Base Price of 0 will correspond to a "traditional" TAS trade which will clear exactly at the final settlement price of the day.
Settlement Procedures Delivery under the NYMEX Henry Hub contract shall be by cash settlement. Final settlement, following termination of trading for a contract month, will be based on the Floating Price. The final settlement price will be the Floating Price calculated for each contract month

Daily NYMEX Henry Hub Futures Settlement Procedure (PDF)
Final NYMEX Henry Hub Natural Gas Look-Alike Last Day Financial Futures Settlement Procedure (PDF)
Position Limits NYMEX Position Limits
Exchange Rulebook 823
Block Minimum http://www.cmegroup.com/clearing/trading-practices/block-trades.html#nymexComexProducts
Price Limit Or Circuit Trading halts and price limits for this contract are subject to the provisions governing Special Price Fluctuation Limits for Henry Hub Natural Gas Futures set forth in Chapter 220.